I have been living in Beijing for almost a year and I'm still surprised at the speed ____ it is developing.A.at what B.at which C.with what D.with which Which one?Why?

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I have been living in Beijing for almost a year and I'm still surprised at the speed ____ it is developing.A.at what B.at which C.with what D.with which Which one?Why?
I have been living in Beijing for almost a year and I'm still surprised at the speed ____ it is developing.
A.at what B.at which C.with what D.with which
Which one?Why?

I have been living in Beijing for almost a year and I'm still surprised at the speed ____ it is developing.A.at what B.at which C.with what D.with which Which one?Why?
B.at which
develop at xxx speed
以什么速度发展.
这是词组.
不能和其它的介词.

选择D项,因为what 是不能用来引导定语从句的

B
at a ... speed 以…的速度
whichi 取代 speed在定语从句里作at的宾语,what则不能