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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、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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