题目内容

Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power．
A．sinceB．afterC．unlessD．before
D
考查固定结构。“It be+一段时间+before 从句”表示“一段时间以后某事才发生”，结合句意可知D正确。句意：我们的政府已经采取了一些措施来克服电力紧缺的问题，但是也许要一段时间以后我们才会有足够的电力。
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