He _____ his homework when his mother came back yesterday evening.A、was doingB、

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问题 He _____ his homework when his mother came back yesterday evening.

选项 A、was doing
B、is doing
C、did
D、does

答案 A

解析 从时间状语从句可以看出该句表示过去某个时刻正在进行的动作,所以应该用过去进行时。如: When I arrived Tom was talking on the telephone.(当我到的时候,汤姆正在打电话。)
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