【approached】beapproached的语法,

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【答案】 这是一个被动语态的不定式形式,
　　1.可以用作句子的谓语：
　　John will be approached by the host as soon as he steps up the stage.
　　2.可以做句子中的非谓语动词各种句子成分：
　　主语：
　　To be approached by the host is required for all the guest speakers.
　　宾语：
　　John had asked to be approached by the host before he stepped up the stage.
　　状语：
　　John arrived early in order to be approached by the host.