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问题: 搞不懂(5)

It is the fact ( ) he doesn't know his birthday ( )surprises us all.这句我有点模糊,前面一个填that我知道,但后个空为什么也是that啊,我当时选的which,以为which引导前面整句,但答案却是that,这种太令我模糊了,求高手解。

解答:

前面的that你真的明白?

后面的that是和前面的it is一起组成强调句型!