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    Even if there is no scientific proof        secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.

    A．whichB．thatC．whenD．where

    B

    解析试题分析:考查名词性从句。Proof后是同位语从句，说明proof的内容，而同位语从句意思完整，不缺少成分，所以用that引导，句意：即使没有科学证据表明吸二手烟会致癌，也没有理由让不吸烟的人们被迫去冒这种危险。
    考点：考查名词性从句。

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