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    精英家教网 > 高中英语 > 题目详情
    I am very worried because my son ________ most of his spare time ________ playing games on the computer.
    A．concentrates；onB．concentrates；in
    C．focuses；toD．focuses；in
    A
    答案　A　[concentrate...on...集中注意力干……相当于focus on。]
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