题目内容

My father was reading a book ________ I was doing my homework.
A．beforeB．afterC．whenD．while
D

试题分析：句意：我在做作业的时候，我爸爸在看书。A在...之前 B在...之后 C当...时候 D当...同时；题中爸爸看书和我做作业这两个动作同时进行，因此用while。while作为当...同时的意思的时候后面要接进行时态。故选D.
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