It's the fact he doesn't know his own birthday surprises us all．A. which whichB. which

问题补充：

Its the fact he doesn know his own birthday surprises us all．

A. which, which

B. which, that

C. that, that

D. that, which

答案：

A. which, which

B. which, that

(答案→)C. that, that

D. that, which

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