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The number of teenagers who commit crime...

The number of teenagers who commit crimes _________ 20% over the past years.

A.have been reduced by B.has been reduced by

C.have been reduced to D.has been reduced to

 

B 【解析】 考查固定短语。句意:过去这些年,青少年犯罪率减少了20%。be reduced to…是指“降低到……(某个位置、具体数目)”,而be reduced by…则是指“降低了……(by后面跟降低的具体幅度,通常为百分比)”。这里20%是指程度,不是具体数值,所以这里用be reduced by。句子主语为the number of sth,动词用第三人称单数形式has been reduced by。故选B项。
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