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现在完成时的被动语态知识讲解“have been done”的用法（北京 ...

现在完成时被动语态用法是高考的重要考点，学习时候应该注意下列几点： ... 现在完成时被动语态的结构为has/ have been done, 使用has been done时主语为单数， ...

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