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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