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
考查連詞用法�！癐t be+一段時間+before…”是固定結構，該結構的意思是“要過……（長）時間才……”。when“．．．．．．的時候”；since“從．．．．．．開始”；unless“除非”；根據(jù)題意D最佳。
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