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、pure
B、efficient
C、potential
D、sufficient

答案D

解析 pure意为“纯的,纯粹的”;efficient意为“有效的,起作用的”;potential意为“潜在的,可能的”;sufficient意为“充足的,足够的”。所填之词修饰supplies,所以应选sufficient。
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