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It’s + adj. + of sb. to do sth. It是形式主语，to do sth.是真正的主语, 当表语(即形容词)能对逻辑主语描述时，常用介词of,而不用for。 例如：It’s very polite of you to give your seat to old people. 你给老人让座，非常有礼貌。 (责任编辑：admin) |