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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．which B．that C．when D．where

    B

    解析试题分析：考查同位语从句：句意：即使没有科学证明二手烟能致癌，但也没有理由非吸烟者要去冒这个险。That引导的是同位语从句，说明proof的内容，that不做成分，只起到连接的作用。选B。
    考点：考查同位语从句

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