The European Union countries were once worried that they would not have______.

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问题 The European Union countries were once worried that they would not have______.

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

答案C

解析句子大意为：欧盟国家曾一度担心它们没有——。将各选项代入，只有C项potential做形容词“潜在的，有潜力的”，做名词“可能性，潜能，电势”，符合题意，因此本题选C。

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