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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 句意为：欧盟国家一度忧虑他们将不会拥有充分的汽油供应。Sufficient“充足的／充分的”；efficient“有效率的”；Proficient“熟练的”；potential“潜在的”
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