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
科目：高中英語 來源： 題型：
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
科目：高中英語 來源： 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
科目：高中英語 來源：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．that | C．when | D．Where |
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