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    【题目】________ cloning may be used for medical treatment, everyone doesn’t support it.

    A. While B. As

    C. Since D. Unless

    【答案】A

    【解析】

    考查连词词义辨析。句意：虽然克隆可以用于医疗，但并不是每个人都支持。A. While虽然；B. As因为；C. Since自从；D. Unless除非。故选A。

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