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

    A．a(chǎn)fter          B．since             C．unless             D．before

10、D

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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．a(chǎn)fter          B．since             C．unless             D．before

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