英语单选题 Our government has taken some measures to o英语单选题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为什么不能

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英语单选题 Our government has taken some measures to o
英语单选题
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
为什么不能选unless 答案是before 最好用语法解释 翻译我觉得unless也说的通啊

D 意思是在我们能源充足之前,要花费很长的时间

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