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    Scientists will have to _____ new ways to solve the water problem.

    A. catch up with
    B. keep up with
    C. come up with
    D. make up with
    C
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    科目：初中英语 来源：同步题 题型：单选题

    Scientists will have to _____ new ways to solve the water problem.
    [     ]
    A. catch up with
    B. keep up with
    C. come up with
    D. make up with

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