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    There is no doubt              scientific knowledge is very important for teenagers.

    A. whether
    B. that
    C. if
    D. what
    B
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    科目：初中英语 来源：期末题 题型：单选题

    There is no doubt              scientific knowledge is very important for teenagers.
    [     ]
    A. whether
    B. that
    C. if
    D. what

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