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We really don't know what( is to face/to fcea)in the future.

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We really don't know what( is to face/to fcea)in the future.括号中应该选哪个?
We really don't know what( is to face/to fcea)in the future.
to face
再问: 从语法上讲为什么是to face
再答: 如果用is,用完整句,就应该改成 We really don't know what we are to face in the future 因为如果选 is to face ,从句就没有主语,所以不成立 而to face, 不定式做后置定语,修饰what