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    精英家教网 > 高中英语 > 题目详情
    The government has taken some measures to solve the shortage of electricity, but it may be some time _______ the situation improves.  
    A．sinceB．whenC．unlessD．before
    D
    考查连词用法。“It be+一段时间+before…”是固定结构，该结构的意思是“要过……（长）时间才……”。when“．．．．．．的时候”；since“从．．．．．．开始”；unless“除非”；根据题意D最佳。
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