强化训练3 主语从句
（时间：15分钟 分数：27分）
Ⅰ.单项选择(每题1分，共20分)
1．(2011·重庆卷)It is still under discussion ________the old bus station should be replaced with a modern hotel or not.
A．whether B．when C．which D．where
答案 A [考查名词性从句。句中It为形式主语，真正的主语为空格处引导的从句。]
2．(2012·新课标全国卷)It is by no means clear ________ the president can do to end the strike.
A．how B．which C．that D．what
答案 D [it是形式主语，空格后是一个主语从句，从句部分的动词do缺少宾语，此处所填单词既要引导主语从句，又在从句中作宾语，四个选项中有此功能的只有what。句意：总统能采取什么措施来结束这场罢工根本不为人所知。 ]
3．(2012·浙江六校联考)________ is surprising is that there are so many Chinese restaurants in Toronto.
A．It B．That C．Such D．What
