Our government has taken some measures to overcome the lack of electricity, but
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Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power．
A.since
B.after
C.unless
D.before
试题答案
D
考察固定结构。It be 一段时间 before从句：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。