题目内容

My brother came back home while I           homework.
A．am doingB．did
C．was doingD．were doing
C

试题分析：句意为：我正在做作业的时候哥哥回来了。根据语境，这里表示的是一个过去某一时刻正在进行或发生的动作，应用过去进行时。故应选C。
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