15、Even if there is no scientific proof yet ______ 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

15、B

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26．Even if there is no scientific proof yet ______ 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

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科目：高中英語(yǔ) 來(lái)源： 題型：

Even if there is no scientific proof yet ______ 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

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：北京市崇文區(qū)2010屆高三下學(xué)期統(tǒng)一練習(xí)（一） 題型：單選題


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

A．which B．thatC．whenD．Where

查看答案和解析>>


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