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英语
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since when did/do you become so diligent
是did 还是do?为啥
人气：172 ℃ 时间：2020-04-13 15:55:01
解答
应该填 have,当 since引导时间状语时,主句要使用现在完成时.“从何时起你变得这样勤奋?”
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