题目内容


单项填空

从每小题所给的A、B、C、D四个选项中选出一个可以填入空白处的最佳选项。

 When the man downstairs knocked at the door, I _______.

              A. am doing housework                           B. was doing housework

              C. were doing housework                         D.am going to do housework

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