What a mistake (it is) to have refused his invitation.

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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?

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.
再问：感觉像定语，感觉又像形式宾语。

What a mistake (it is) to have refused his invitation. It is a mistake to trust I have found that it is a common mistake to "over talk" when How（）it is to make such a mistake! I see what it is like to have a what people say is like an invitation but it is not a real o What a mistake!— Yes.I had suggest his doing it another way, what's wrong (a It's a mistake.B I have a headache)单选 It is s__ of you not to forgive your cousin for his mistake. What time is it?It's time___lunch.A.have B.to have C.having ____great fun it is to have a picnic.是what a 还是what?理由 _____ great fun it is to have barbecues!A、What a B、What C、Ho