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    We believe scientists will _____ a way to solve the problem of airpollution.

    A. set off
    B. put off
    C. come up with
    D. catch up with
    C
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    科目：初中英语 来源：专项题 题型：单选题

    We believe scientists will _____ a way to solve the problem of airpollution.
    [     ]
    A. set off
    B. put off
    C. come up with
    D. catch up with

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