| 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 |
科目：高中英語 來源：0112 期中題 題型：單選題
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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