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— ____ 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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