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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
    C
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    科目：高中英语 来源：0112 期中题 题型：单选题

    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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    科目：高中英语 来源： 题型：

    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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