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    Scientists should _____ new ways to solve the pollution problem.

    A. catch up with
    B. come up with
    C. keep up with
    D. make up with
    B
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    科目：初中英语 来源：0103 期中题 题型：单选题

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

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