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英语
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Though she has been teaching us for only three years,I respect and love her very much.
teach为什么不用过去式,而用ing呢
人气：129 ℃ 时间：2019-10-23 06:51:44
解答
表示持续过程直到现在有多长时间,用现在完成进行时.即has been doing.
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