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

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
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

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
D 意思是在我们能源充足之前,要花费很长的时间