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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

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。
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