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    精英家教网 > 高中英语 > 题目详情
    If his parents are convinced ____the fact that his son always focuses his mind       his study.  
    A．of; onB．of; atC．by; toD．on; at
    A
    be convinced of sth “确信；坚信某事。”focus one’s mind/attention on sth.将注意力集中于某事物。
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