英语求教，请告诉我为什么谢谢了

Question

1. Mary lives in the room, the door _____ opens east.
A. of it B. of which C. of that D. whose
2. The engineer _____ my father is talking has just come from abroad.
A. with whom B. with who C. with which D. that
5. The speaker will tell us about some writers and their works _____are known to us.
A. which B. that C. as D. who

Answer 1

都是定语从句
1、B 代入原句the door of the room opens east
2、A my father is talking with the engineer ,介词后面不加who,用whom
5、B 先行词some writers and their works ，有人有物用that追问

我选的是DBD请告诉我为什么错了

追答

1、如果选whose的话，句子要变为Mary lives in the room,（whose） door opens east
2、介词后面不加who,用whom
3、有人有物只能用that不用which，这个没有解释了

本回答被提问者采纳

Answer 2

一般定语从句都可以分为两句的。将上面三句分解后就变成如下：
1. Mary lives in the room. The door of the room opens east.
2. The engineer has just come from abroad. My father is talking with the engineer.
3. The speaker will tell us about some writers and their works. The writers and their works are known to us.
综上所述，答案就是：B. A B.

Answer 3

1. B,
2. A,
3. B追问

我有答案，只是想知道为什么这样选