\documentclass[10pt]{ctexart} \usepackage[paperwidth=21cm,paperheight=29.7cm,top=2.6cm,bottom=2.533cm,right=1cm,left=1cm,headheight=24pt,footskip=41pt]{geometry} \usepackage{color} \linespread{1.9} \begin{document} \noindent \par \hangindent 0.4cm \hangafter 1 \noindent \makebox[0.4cm][r]{4. }完成句子 \quad\\[0pt] (1).{\fontsize{60.0pt}{\baselineskip}\selectfont \CJKunderline[textformat=\color{white}]{$\frac{2}{3}$}}(大量的) time and money has been spent on the project, so they can't give it up halfway. \quad\\[0pt] (2).{\fontsize{50.0pt}{\baselineskip}\selectfont \CJKunderline{我是答案}}(众所周知) Americans like moving. Most of them move seven times in their life. \end{document}
一个尝试:在加下划线的内容之前插入零宽的 `\rule`
```tex
\CJKunderline[hidden, textformat=\rule{0pt}{1.5ex}]{...}
```
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