2. 考研
  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、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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