It is the fact he doesn’t know his own birthday surprises us all.A. which; whichB. that; t

问题补充：

It is the fact he doesn’t know his own birthday surprises us all.

A. which; which

B. that; that

C. which; that

D. that; which

答案：

A. which; which

(答案→)B. that; that

C. which; that

D. that; which

解析：考察同位语从句和强调句型。同位语从句That he doesn’t know his own birthday解释the fact的内容。第二空that与it is构成强调句型。故B正确。