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    【题目】— Would you like to do it at all?
    — I'd love to, but the question is _____it is worth doing.
    A.if
    B.whether
    C.when
    D.that

    【答案】B
    【解析】句意：你到底想不想做？我想做，但问题是它是否值得做。此处为表语从句，whether和if引导名词性从句时，意为“是否”，但是引导表语从句时，只能用whether不能用if；when引导名词性从句时，作从句的时间状语，而在本句中句意不通；that引导名词性从句时，只起连接作用，没有汉语意思。故选B。

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