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【题目】Li Hua has been back to his hometown twice he moved to Shanghai.

A. before B. when C. till D. since

【答案】D

【解析】句意:李华自从搬到上海,他已经回过他的家乡两次。before在……之前;when当……时候;till直到;since自从。根据Li Hua has been back to his hometown twice可知主句用了现在完成时。since引导的从句表示从过去时间开始持续到现在的动作,故与现在完成时连用,故选D。

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