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You must concentrate more _________ your...

You must concentrate more _________ your English.

A.to         B.in        C.on       D.at

 

C 【解析】 试题分析:句意:你必须更多地把注意力集中在你的英语上。concentrate on把注意力集中在……上。据句意,故选C。 考点:考查介词。  
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