题目内容
(2010·江苏省镇江中学高三下学情调查) 28. We need to further develop renewable energy sources ___________ fossil fuels .
A. until; are running out B. before; are run out
C. after; have been run out D. before; run out
D
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题目内容
(2010·江苏省镇江中学高三下学情调查) 28. We need to further develop renewable energy sources ___________ fossil fuels .
A. until; are running out B. before; are run out
C. after; have been run out D. before; run out
D