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【单选题】

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

B．efficient
C．potential
D．sufficient
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

13%的考友选择了B选项

4%的考友选择了C选项

83%的考友选择了D选项

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