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    【题目】Scientists think calculating is a necessary skill_________ they base their researches.
    A.on it
    B.on that
    C.on which
    D.on whose

    【答案】C
    【解析】句意：科学家认为计算是一种依据他们的研究为基础的必须技能。 base on....固定短语，“依据......为基础”。a necessary skill做先行词，指物，在后面的定语从句中做on的宾语，故选C。

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