Peter,do remember_____is dangerous to play with fire!A this B that C it Dits选哪个为什么?

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Peter,do remember_____is dangerous to play with fire!A this B that C it Dits选哪个为什么?

Peter,do remember_____is dangerous to play with fire!A this B that C it Dits选哪个为什么?
Peter,do remember_____is dangerous to play with fire!
A this B that C it Dits
选哪个为什么?

Peter,do remember_____is dangerous to play with fire!A this B that C it Dits选哪个为什么?
C
彼得,一定要记住玩火很危险.
it 作宾语从句的形式主语,真正的主语是不定式to play with fire.

C it is dangerous to do sth 固定句式

C
it 这个代词可以作为形式宾语,不定式是真正的主语;而其他代词无此用法。