问题
选择题
| 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 |
答案
答案：C
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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 |
答案：C