1.perfect infinitive不定式完成时
to have past participle
2.passive infinitive动词不定式的被动式
to be past participle
3.to在主被动语态省略
动词不定式
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1201.perfect infinitive不定式完成时
to have past participle
2.passive infinitive动词不定式的被动式
to be past participle
3.to在主被动语态省略