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    The government has taken some measures to solve the shortage of electricity , but it may be some time _________the situation improves.
    A．sinceB．whenC．beforeD．unless
    C
    考查固定句型。It be 一段时间before 从句，表示一段时间以后某事才发生。Before时间状语从句里用一般现在时表示将来时，主句里可以使用将来时或者情态动词。句意：也许一段时间以后情况才会改善。
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