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18.I am in a hurry because the train will leave ____________ half an hour.(  )
A.byB.forC.inD.over

分析 我很匆忙因为火车半小时后离开.

解答 答案是C.本题主要考查表示时间的介词辨析. by 后接点时间表示"到…时候为止"; for 后接段时间表示"延续了…时间";in 后接段时间,表示"在…时间内";用在将来时的句中往往表示"…段时间之后";over后接段时间表示"在整个…期间";表示根据句意和介词搭配判断,本题状语从句中是将来时,表示"半小时以后"所以答案选择C.

点评 介词辨析要在掌握各介词的基本用法和固定搭配的基础上结合语境做出符合逻辑、常理的推测.

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