【求详解】一道托业语法选择题：

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/04 20:00:37

【求详解】一道托业语法选择题：
It's mandatory that passengers ( ) their seat belts.
A.fasten B. fastening C.should fasten D. have fastened

A
It's mandatory that 后面跟动词原形的用法
乘客们必须系上安全带

一道英语选择题.求语法详解一道高中英语选择题,求详解一道英语选择题,求详解一道托业语法选择题Caro Bridwell has ( ) a senior partner in the law f 一道高一物理选择题,求详解关于比较级的一道选择题,求详解. 一道大学英语选择题（求详解）一道英语非谓语选择题求详解. 一道高数选择题,求详解问一道英语选择题,求详解求详解一道英语选择题,呵呵! 一道SAT语法题,求详解