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有没有一种方法只需写“____”即可获得宽度为 4em 的下划线 hphantom？

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有没有一种方法只需写“____”即可获得宽度为 4em 的下划线 hphantom？

我需要排版一些填空项目。我想写

\item We are ____ sure that his skills qualify him for the job.

代替

\newcommand{\blanks}[1][4em]{\underline{\makebox[#1]{}}}
...
\item We are \blanks sure that his skills qualify him for the job.

为了便于阅读。有人能帮助我吗？

编辑

\documentclass{article}
\usepackage{calc,url,graphicx}% or hyperref

% \newcommand*{\blanks}[1][4em]{\rule{#1}{.4pt}}

% \catcode`\_=\active

% \def_{\blanks[1em]}

% \everymath{\catcode`\_=8\relax}

% \newcommand*{\makeunderscorenormal}{\catcode`\_=8\relax}
% \newcommand*{\makeunderscoreweird}{\catcode`\_=\active}
% \newcommand*{\blank}[1]{\blanks[\widthof{#1}]}

\begin{document}
\includegraphics{a_b/1.png}
% We are ____ sure that his skills qualify him for the job.

    % We are \blank{not} sure that his skills qualify him for the job.

    % \url{http://www.tex_stackexchange.com}

    $ 1_2 $
\end{document}

确实有效，但是

\documentclass{article}
\usepackage{calc,url,graphicx}% or hyperref

\newcommand*{\blanks}[1][4em]{\rule{#1}{.4pt}}

\catcode`\_=\active

\def_{\blanks[1em]}

\everymath{\catcode`\_=8\relax}

\newcommand*{\makeunderscorenormal}{\catcode`\_=8\relax}
\newcommand*{\makeunderscoreweird}{\catcode`\_=\active}
\newcommand*{\blank}[1]{\blanks[\widthof{#1}]}

\begin{document}
\includegraphics{a_b/1.png}
We are ____ sure that his skills qualify him for the job.

    We are \blank{not} sure that his skills qualify him for the job.

    \url{http://www.tex_stackexchange.com}

    $ 1_2 $
\end{document}

才不是。

答案1

您可以使其_活跃（并在数学模式中将其定义“改回”为下标）。

我还在\blank宏中添加了一个选项，该选项可以制定与给定文本一样长的规则。

我还添加了宏\makeunderscorenormal并将\makeunderscoreweird其改回正常定义（即数学下标，即文本模式下的错误）。

代码

\documentclass{article}
\usepackage{calc,url}% or hyperref

\newcommand*{\blanks}[1][4em]{\rule{#1}{.4pt}}
\newcommand*{\blank}[1]{\blanks[\widthof{#1}]}

\begingroup
    \catcode`\_=\active
    \gdef_{\blanks[1em]}
\endgroup
\everymath{\catcode`\_=8\relax}

\newcommand*{\makeunderscorenormal}{\catcode`\_=8\relax}
\newcommand*{\makeunderscoreweird}{\catcode`\_=\active}
\begin{document}
    \begin{itemize}\makeunderscoreweird
        \item We are ____ sure that his skills qualify him for the job.
        \item We are \blank{not} sure that his skills qualify him for the job.
    \end{itemize}
    \url{http://www.tex_stackexchange.com}

    $ 1_2 $
\end{document}

输出

在此处输入图片描述

答案2

我不太热衷于修改类别代码。这是一种不修改类别代码的方法，它只会改变 的含义\_：

\documentclass{article}
\usepackage{amsmath}% for \new@ifnextchar
\usepackage{calc}

\newcommand*{\blanks}[1][4em]{\rule{#1}{.4pt}}
\newcommand*{\blank}[1]{\blanks[\widthof{#1}]}

\makeatletter
\DeclareRobustCommand{\_}{\blanks[.5em]\@doblanks}
\def\@doblanks{%
  \new@ifnextchar_{\blanks[.5em]\expandafter\@doblanks\@gobble}{}%
}
\makeatother

\begin{document}

\begin{itemize}
\item We are \____ sure that his skills qualify him for the job.
\item We are \______________ his skills qualify him for the job.
\item We are \blanks[7em] his skills qualify him for the job.
\item We are \blank{not} sure that his skills qualify him for the job.
\end{itemize}

\end{document}

第二项有 14 个下划线，对应第三项中的 7em。

如果你真的想要避免使用开头的反斜杠，则请将其_激活：

\documentclass{article}
\usepackage{calc}
\usepackage{url}

\newcommand*{\blanks}[1][4em]{\rule{#1}{.4pt}}
\newcommand*{\blank}[1]{\blanks[\widthof{#1}]}

\begingroup\lccode`\~=`\_
\lowercase{\endgroup
  \protected\def~}{\ifmmode\expandafter\sb\else\blanks[.5em]\fi}
\AtBeginDocument{
  \catcode`\_=\active
  \mathcode`\_="8000
}

\begin{document}

\begin{itemize}
\item We are ____ sure that his skills qualify him for the job.
\item We are ______________ his skills qualify him for the job.
\item We are \blanks[7em] his skills qualify him for the job.
\item We are \blank{not} sure that his skills qualify him for the job.
\end{itemize}

Some math $x_{1}$ and a URL \url{http://www.tex_stackexchange.com}

\end{document}

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