2. 外语
  3. When you worry you tend not to be able to fall asleep and when you can’t fall asleep you worry even more. It’s a ______ circle.

When you worry you tend not to be able to fall asleep and when you can’t fall asleep you worry even more. It’s a ______ circle.

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问题 When you worry you tend not to be able to fall asleep and when you can’t fall asleep you worry even more. It’s a ______ circle.
选项 A、repetitive
B、bad
C、round
D、vicious
答案D
解析 vicious circle是习惯用语，表“恶性循环”。
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专业英语四级

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