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What were you doing when

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解题思路: 正确运用过去进行时
解题过程:
When the light went out at nine o’clock yesterday evening, Mr Black was watching a basketball match. Later he decided to listen to the radio. Mary was playing the piano at that time. Then she stopped to have a rest. Tom was doing his homework in his room. Later he went to bed. Mrs Black was not lucky, she was in the lift at that time. She couldn’t get out until the worker came to help her.
最终答案:略