I do not remeber how many years ago_______State Street began its business in China.A,it was when B.it was that C.was it when D.was it that我已经知道答案为B请问选项A为什么不对?

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I do not remeber how many years ago_______State Street began its business in China.A,it was when B.it was that C.was it when D.was it that我已经知道答案为B请问选项A为什么不对?
I do not remeber how many years ago_______State Street began its business in China.
A,it was when B.it was that C.was it when D.was it that
我已经知道答案为B请问选项A为什么不对?

I do not remeber how many years ago_______State Street began its business in China.A,it was when B.it was that C.was it when D.was it that我已经知道答案为B请问选项A为什么不对?
B 选项中的that 是指代到底是几年,三年,四年.而正好that 也是代词,代的就是那三四年.
你觉得这个when,它能代这儿三年,四年么?