It's very polite( )you to help others when they need help.A.of B.for C.with D.on书上答案是A,但有一个句式是It's+a.+for sb.+to do sth.,为什么不是B呢?

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It''sverypolite()youtohelpotherswhentheyneedhelp.A.ofB.forC.withD.on书上答案是A,但有一个句式是It''s+a.+forsb.+todo

It's very polite( )you to help others when they need help.A.of B.for C.with D.on书上答案是A,但有一个句式是It's+a.+for sb.+to do sth.,为什么不是B呢?
It's very polite( )you to help others when they need help.
A.of B.for C.with D.on
书上答案是A,但有一个句式是It's+a.+for sb.+to do sth.,为什么不是B呢?

It's very polite( )you to help others when they need help.A.of B.for C.with D.on书上答案是A,但有一个句式是It's+a.+for sb.+to do sth.,为什么不是B呢?
of修饰后面的人,for修饰后面的事情
这句话中polite不能修饰一件事情,只能修饰人所以选A

polite[pə'lait]
adj. 有礼貌的, 客气的, 有教养的, 文雅的
It is not polite of you to cut the speaker short.
你打断发言者的话,真不礼貌。

polite 是形容you有礼貌，不是形容这件事情。。。形容人的用of ，而形容后面整个一大段主语的用for。。。上面一句句子其实就是‘It's very kind of you。。。’换汤不换药的形式。。。
通常出现kind，polite，friendly。。。等（包括它们的反义词）一系列形容人的adj用of，自己体会一下吧 o(∩_∩)o 哈哈。。。...

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polite 是形容you有礼貌，不是形容这件事情。。。形容人的用of ，而形容后面整个一大段主语的用for。。。上面一句句子其实就是‘It's very kind of you。。。’换汤不换药的形式。。。
通常出现kind，polite，friendly。。。等（包括它们的反义词）一系列形容人的adj用of，自己体会一下吧 o(∩_∩)o 哈哈。。。

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选A是不错的，这是一个句式It's+adj+0f + sb.+to do sth.这里用for是不通顺的，用of是说明前面的形容词是对这个主语的修辞，

It seems that he's very polite.(改为同义句） ___seems___ ____very polite. 首字母填空 The litter boy is very b______.It's not polite. It's polite for people----------thanK you veIt's polite for people----------thanK you very often.A.to sPeaK B.to talK C.to tell D.to say it's not polite _____talk _____your mouth full it's not polite _____talk 你坐下很不礼貌 It's not very polite _ _ _ _down再说一下什么时候用for什么时候用of, It's not polite to ask other people______(person) question. It's not polite to s___ at your parents. It's not polite to talk to your mother______that It's polite of sb to do sth 准确翻译 It's not polite to c___gum in publicc_____填什么 It's ____ (polite) to smoke in public It's polite to say please英语同义句 it's polite for you to leave w____ saying people laugh at等于It's not polite to laugh at others.It's not polite to _____ ______ ______ others. laugh at等于It's not polite to laugh at others.It's not polite to _____ ______ ______ others. It's very kind____you. It's very funny It's very nice!