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    27．Our government has done a lot to solve the shortage of oil, but it may take some time we have enough. A．after B．since C．before D．unless 【查看更多】

     

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    Our government has done a lot to solve the shortage of oil, but it may take some time _____ we have enough.
    [     ]
    A. after
    B. since
    C. before
    D. unless

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    Our government has done a lot to solve the shortage of oil，but it may take some time     we have enough．

        A．after          B．since             C．unless             D．before

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