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：高中英語 來源：0112 期中題 題型：單選題

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：高中英語 來源： 題型：

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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