单选题：Scientists have discovered that what prevents people from co

题目分类：英语
题目类型：单选题
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题目内容：

Scientists have discovered that what prevents people from concentrating is_______． A．any kind of noise
B．great changes in level of noise
C．background noise
D．various background music

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答案解析：

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He suddenly returned_______a rainy night．A．at B．on C．in D．during

分类：英语题型：单选题

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