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

試題分析：考查同位語從句：句意：即使沒有科學證明二手煙能致癌，但也沒有理由非吸煙者要去冒這個險。That引導的是同位語從句，說明proof的內容，that不做成分，只起到連接的作用。選B。
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