题目内容

— ____ sweep the classroom yesterday？
—I was playing tennis with my friend．
A．Why notB．Why didn'tC．Why don'tD．Why didn't you
D
选项B、C错误，因为句子缺主语；选项A错，因为“Why not（+动词原形）”这一结构通常不用于过去（即不与过去时间连用）。
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