What a mistake (it is) to have refused his invitation.to have refused his invitation在句子中作什么成分?

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What a mistake (it is) to have refused his invitation.to have refused his invitation在句子中作什么成分?
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What a mistake (it is) to have refused his invitation.to have refused his invitation在句子中作什么成分?
What a mistake (it is) to have refused his invitation.
to have refused his invitation在句子中作什么成分?

What a mistake (it is) to have refused his invitation.to have refused his invitation在句子中作什么成分?
to have refused his invitation在此句子中是真正的主语,it是形式宾语.将此感叹句改为陈述句是:It is a mistake to have refused his invitation.之所以用感叹句,其目的是此错误之大,遗憾之深.例如:
What a pity (it is) to have missed the wonderful film.

作 mistake 的定语。 即不定式作定语。