【题目】The government has taken some measures to solve the shortage of electricity , but it may be some time _________the situation improves.
A. sinceB. when
C. beforeD. unless
在线课程【答案】C
【解析】
试题句意：政府已经采取了一些措施来解决电力的短缺，但是在情况得到改善之前可能还要一段时间，before在…之前，故选C
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