根据提示填空(每空一词)
—What were you doing when we were playing basketball yesterday afternoon?
—I ____ ____ (clean) the classroom.

答案

was,cleaning

知识点:动词时态:过去进行时  

解题思路

问句用过去进行进行提问,所以回答也要用过去进行时。所以答案为was cleaning。

易错点

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