问题描述：
is the fact _____ he doesn't know his birthday _____ surprises us all.
It is the fact _____ he doesn't know his birthday _____ surprises us all.
A.which,which B.which,that C.that,that D.that,which
请给出相关的语法解释。
It is the fact _____ he doesn't know his birthday _____ surprises us all.
A.which,which B.which,that C.that,that D.that,which
请给出相关的语法解释。
问题解答：
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