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、proficient
B、efficient
C、potential
D、sufficient

答案D

解析 本题考形容词的辨析。proficient意为“精通的”;efficient意为“效率高的”;potential意为“潜在的”;sufficient意为“充分的”。结合句意,故D项正确。本句大意为:欧盟国家曾担心他们没有足够的石油供应。
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