C
考查固定句型。It is +adj. for/ of sb. to do sth.“做某事对某人来说......”，当句型中的形容词指人的品质时，用介词of，其它用for。Polite指人的品质，故用of。句意“给老人让座，你真是太有礼貌了。”故选C。
It is polite ______ you to give seats to the elderly. A．with
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