That is the reason ___she can't say 空 里为什么不能填which?

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That is the reason ___she can't say 空 里为什么不能填which?

这是一句定语从句,which和that都是修饰物的,而在引导限定性定语从句时,that有时相当于in which,at which,for which或at which ,所以这里只能用that或in which,at which,for which或at which .