Question

【题目】— Why didn’t you try your best to get on the underground?

— I tried to, but it started moving ______ I could get on it.

A. before B. while C. as soon as D. after

Answer 1

【答案】A

【解析】试题分析：句意：你为什么不尽最大努力乘坐地铁？我尽力啦，但在我上车前它就开了。Before在……之前；while当……时候，as...as...一……就……；after在……后。根据句意可知选A。