Question

【题目】I was reading a book ______ my sister was watching TV.
A.after
B.before
C.during
D.while

Answer 1

【答案】D
【解析】句意:当我妹妹正在看电视时,我正在读书。A. after在……后面;B. before在……之前; C. during在……期间;D. while当……时候,后面的从句一般用进行时态,表示一段时间,主句也用进行时态。结合句意可知选D。