请教几道英语定语从句题

1.I travel to Binhai New Area by light railway every day,（    ）do many businessmen who live in downtown Tianjin.
A.as                   B.which       C.when        D.though
(注：林老师解说这句缺主语，我不明白它哪缺主语)
2.The best work ___C___ Lu Xun wrote and ______ I have read has been made into a film.
A、which ;that    B、that;×    C、×; that    D.×;×
(为什么？)
3、Is this the house ___C___ Shakespeare was born?
A、at which    B、which    C、in which    D、at where
4、Is this house ___A___ Shakespeare was born?
A、where    B、which    C.、n which    D、at which
(解释两道题的区别)

谢谢！

1、逗号后do缺主语（B）
2、我认为是先行词做宾语最高级后应用that或不用，后面的那个也是定语从句先行词是做主语，应用关系代词
3、4、be born in +place  3强调出生  4强调这间房子

3题变陈述句为This is the house..........       先行词为house
4题变为This house is..........          先行词为is,缺主语，用关系副词

1题，我感觉选A，非限制性定语从句，as正如之意，我认为这里真正的主语是businessmen,as businessmen do，因为后面有个定语从句为了句子协调，放后面了！
2题c    因为，从句缺宾语，又有两个定语从句连用，为避免歧义，前一个that可以省略，而后一个不可以，所以C
3题 同样是定语从句，先行词house，in the house，所以用in which或where都可以,只有c
4题 这里只有where，不知道c选项是否是in which要是的话，我认为也可以选
 
打得好累啊！

[ 本帖最后由 zhangkaiyuan050 于 2009-8-9 22:02 编辑 ]