2. 外语
  3. He _____ his homework when his mother came back yesterday evening.

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

admin2014-03-31  93
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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