The government has taken some measures to solve the shortage of electricity, but it may be some time ____________ the situation improves.
A.sinceB.whenC.unlessD.before
D

試題分析:考察固定句式。固定句式:It be 一段時(shí)間 before…一段時(shí)間以后某事才發(fā)生;如果before后面使用一般現(xiàn)在時(shí),前面的主語(yǔ)使用將來(lái)時(shí);如果before后面使用一般過(guò)去時(shí),前面也使用一般過(guò)去時(shí)。句意:政府已經(jīng)采取措施來(lái)解決電量短缺的問(wèn)題,但是也許要一段時(shí)間以情況才會(huì)有所改善。故D正確。
點(diǎn)評(píng):固定句式的考察是時(shí)態(tài)以及連詞考察的重點(diǎn),本句中的固定句式:It be 一段時(shí)間 before…一段時(shí)間以后某事才發(fā)生;如果before后面使用一般現(xiàn)在時(shí),前面的主語(yǔ)使用將來(lái)時(shí);如果before后面使用一般過(guò)去時(shí),前面也使用一般過(guò)去時(shí)。
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