the government has taken some measures to solve the shortage

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/04/28 21:50:03

the government has taken some measures to solve the shortage of rice ,but it may
be some time _____the situation improves.
a.before b.when c.unless d.since
c 为什么不对?

It + 时间+ before 是常见结构,表示还有多少时间,某事才会发生.
如果用unless ,it may be some time unless the situation improves 除非情况改善,否则会有一段时间,句意不通!

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