【題目】To solve the shortage of electricity,the government has taken some measures, but it will be some time________the situation returns to normal.

A.sinceB.whenC.beforeD.unless

【答案】C

【解析】

考查固定句型和從屬連詞。句意：為了解決缺乏電的情況，政府采取了一些措施，但是也許一段時間以后情況才能恢復(fù)正常。A. since自從；B. when當(dāng).......時候；C. before在......之前；D. unless除非�！�It+be+一段時間+before......”是固定結(jié)構(gòu)，表示一段時間以后某事才發(fā)生。before時間狀語從句里用一般現(xiàn)在時表示將來時，主句里可以使用將來時或者情態(tài)動詞。故選C項(xiàng)。

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