Even if there is no scientific proof secondhand smoke causes cancer, there

题干

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

上一题下一题 0.64难度单项选择更新时间:2013-10-29 06:06:35

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