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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