【題目】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：李華自從搬到上海，他已經(jīng)回過(guò)他的家鄉(xiāng)兩次。before在……之前；when當(dāng)……時(shí)候；till直到；since自從。根據(jù)Li Hua has been back to his hometown twice可知主句用了現(xiàn)在完成時(shí)。since引導(dǎo)的從句表示從過(guò)去時(shí)間開(kāi)始持續(xù)到現(xiàn)在的動(dòng)作，故與現(xiàn)在完成時(shí)連用，故選D。

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