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

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

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

答案A

解析 句意:欧盟国家曾担心石油供应不足。形容词辨析。  sufficient“足够的”;proficient“精通的,熟练的”;efficient“有效的”;potential“潜在的,不能的”。
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