I am very worried because my son most of his spare time playing games on the computer.A．concentrates,on B．concentrates,in C．focuses,to D．focuses,in 题目和参考答案——青夏教育精英家教网—

题目内容

I am very worried because my son ________ most of his spare time ________ playing games on the computer.

A．concentrates；on B．concentrates；in

C．focuses；to D．focuses；in

【解析】答案　A　[concentrate...on...集中注意力干……相当于focus on。]

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