有关定语从句的几道单选题~

题目

有关定语从句的几道单选题~
1.Do you know that gril____wearing a red dress?
A.whose B.who C.whom D.who's
为什么会选D选项,
2.That is the reason____he gave us for carrying out the plan.
A.because B.why C.how D.which
3.The reason____I' writing to you is to tell you about a party on Saturday.
为什么第三题选择why 而第二题就选which,不是有reason就要选why吗?
4.The reason why he was late was____he had taken a wrong bus.
A.because B.whether C.when D.that
这道题又是什么东东?好像是什么系动词后表语从句..

答案

1选b的话 从句中没有谓语动词了
2.当先行词是reason时,若从句中不缺主语维语用why,反之用which
4d 这是个句型 the reason why .is that