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    I decided to concentrate all my efforts _____ the complicated problem.

    A. to solve
    B. to be solved
    C. on solving
    D. in solving
    C
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    科目：高中英语 来源：0109 同步题 题型：单选题

    I decided to concentrate all my efforts _____ the complicated problem.
    [     ]
    A. to solve
    B. to be solved
    C. on solving
    D. in solving

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