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    精英家教网 > 高中英语 > 题目详情
    He used to ____his teaching when he was young.
    A．devote toB．be devoted toC．devoting toD．being devoted to
    B
    used to 接动词原形表示”过去常常”；”致力于”应该是devote one-selt to 或be devoted to…，所以答案为B。
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