几个有关定语从句的问题

For many cities in the world,there is no room to spread out furthur,___ New York is an example.

A.for which B.in which C.of which D.from which.

Human facial expressions differ from those of animals in degree ___ they can be controlled on purpose.

A.with which B.to which C.of which D.for which

下面是两道填空的.

He reached London in 1996,___,some time later,he became a famous actor.

___we had expect,he married her.

多谢各位英语达人帮忙,最好附上解题的过程,谢谢.

C, an example of , which指代前面整个句子

B, to the degree ，which 指代degree

where, 相当于in London，做从句的地点状语，因为时间状语有了（some time later)

As， 正如