the government has taken some measures to solve the shortage of rice ,but it may

the government has taken some measures to solve the shortage of rice ,but it may

题目
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?
答案
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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