The European Union countries were once worried that they would not have ______ s

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问题 The European Union countries were once worried that they would not have ______ supplies of petroleum.

选项 A、proficient
B、efficient
C、potential
D、sufficient

答案 D

解析根据句意应选sufficient足够的。proficient精通的；efficient高效的；potential潜在的，均不合题意。句意：欧盟各国曾经担心它们会缺乏充足的石油供应。

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