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 一段時(shí)間before 從句，表示一段時(shí)間以后某事才發(fā)生。Before時(shí)間狀語從句里用一般現(xiàn)在時(shí)表示將來時(shí)，主句里可以使用將來時(shí)或者情態(tài)動(dòng)詞。句意：也許一段時(shí)間以后情況才會(huì)改善。
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