_good manners to give a seat to an old man on bus.A.It is B.There are选A不选B为什么

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_good manners to give a seat to an old man on bus.A.It is B.There are选A不选B为什么
_good manners to give a seat to an old man on bus.
A.It is B.There are
选A不选B为什么

_good manners to give a seat to an old man on bus.A.It is B.There are选A不选B为什么
manners 固定的表示礼貌这里不牵扯单复数问题
在公交车上给老年人让座时一种礼貌/美德
It is 是非常常见的表示什么什么行为是什么样的
There are 表示有(什么东西）和句子意思差的实在太远了.

good manners 意为礼貌，不可数

句型决定的: it(形式主语).... to do sth( 真正的主语)=
To give a seat to an old man on bus is good manners
翻译: 在公交车上给老人让座是好行为习惯

在这里， it 是形式主语，代替后面的 to give...bus,也就是说后面的才是真正的主语，但是由于太长，就用it作为形式主语来代替它，从某种程度上来说，这是一个固定搭配。如果你想掌握这个知识点，不妨在语法书上找到形式主语的知识点进行系统学习。
希望我的回答你能满意！...

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在这里， it 是形式主语，代替后面的 to give...bus,也就是说后面的才是真正的主语，但是由于太长，就用it作为形式主语来代替它，从某种程度上来说，这是一个固定搭配。如果你想掌握这个知识点，不妨在语法书上找到形式主语的知识点进行系统学习。
希望我的回答你能满意！

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选A是因为it当这句话的逻辑主语，就是可以这样理 to give a seat to an old man on bus is a good manner ．

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