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    【题目】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】

    试题句意：政府已经采取了一些措施来解决电力的短缺，但是在情况得到改善之前可能还要一段时间，before在…之前，故选C

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