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【题目】The police ___________ for the missing girl for a day since they received the call for help.
A.searching
B.have searched
C.searched
D.to search

【答案】B
【解析】句意:自从警察接到求助电话,他们就寻找失踪女孩已经一天了。searching 寻找,搜寻,是动名词形式;have searched现在完成时,已经寻找;searched搜寻,过去式;to search是动词不定式形式。句中since引导的是时间状语从句,从句中用一般过去时态,主句用现在完成时。故应选B。

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