单选题
He _____ his homework when his mother came back yesterday evening.
A、
was doing
B、
is doing
C、
did
D、
does
【正确答案】
A
【答案解析】
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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