Question

【题目】-What were you doing it was raining.

-I was reading a book.

A. before B. if C. while D. after

Answer 1

【答案】C

【解析】句意：当下雨时你正在干什么？-----我正在读书。考查连词用法。A. before在…以前，以前； B. if 如果； C.当…时候，引导时间状语从句，while后面的从句进行时态； D. after在…以后。结合句意和语境可知选D。