It's polite______"Thank you".A.say B.to say C.saying D.said 选什么,为什么、?
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It's polite______"Thank you".A.say B.to say C.saying D.said 选什么,为什么、?
It's polite______"Thank you".A.say B.to say C.saying D.said 选什么,为什么、?
It's polite______"Thank you".A.say B.to say C.saying D.said 选什么,为什么、?
B
是it's + 形容词 + to do 的结构,再如:
It's important to learn English well.
当然是B 这里的to do结构是实际主语,it是形式主语