【題目】The government has taken some measures to solve the shortage of electricity , but it may be some time _________the situation improves.

A. sinceB. when

C. beforeD. unless

【答案】C

【解析】

試題句意：政府已經(jīng)采取了一些措施來解決電力的短缺，但是在情況得到改善之前可能還要一段時(shí)間，before在…之前，故選C

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