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

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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