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英语
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how long have you done that
为什么done 处不能用been doing
人气:306 ℃ 时间:2020-01-27 18:11:05
解答
这个句子的主语是you,been doing是被动,与主语不符,you做主语,应该是主动语态,另外句子的意思是你做了多久才把它完成?是过去完成时,而不是过去进行时,所以此处应该是done
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