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?yàn)榛疖嚢胄r(shí)后離開．

解答 答案是C．本題主要考查表示時(shí)間的介詞辨析． by 后接點(diǎn)時(shí)間表示"到…時(shí)候?yàn)橹?； for 后接段時(shí)間表示"延續(xù)了…時(shí)間"；in 后接段時(shí)間，表示"在…時(shí)間內(nèi)"；用在將來(lái)時(shí)的句中往往表示"…段時(shí)間之后"；over后接段時(shí)間表示"在整個(gè)…期間"；表示根據(jù)句意和介詞搭配判斷，本題狀語(yǔ)從句中是將來(lái)時(shí)，表示"半小時(shí)以后"所以答案選擇C．

點(diǎn)評(píng) 介詞辨析要在掌握各介詞的基本用法和固定搭配的基礎(chǔ)上結(jié)合語(yǔ)境做出符合邏輯、常理的推測(cè)．

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