请把下列句子变为被动语态：我只知道被动语态的构成是：be＋动词过去分词1.The teacher is keeping the pupils at school for a revision.2.You must finish the article before Friday.3.They promised Mary a new doll for her birt
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求英语解答：把下列句子变为被动语态
请把下列句子变为被动语态：我只知道被动语态的构成是：be＋动词过去分词1.The teacher is keeping the pupils at school for a revision.2.You must finish the article before Friday.3.They promised Mary a new doll for her birt
把下列句子改成被动语态,一空一词 .
请把句子改为被动语态!
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把句子改为被动语态
英语：把下列句子改写成被动语态
变为被动语态
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将下列句子改被动语态,
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被动语态..用句子 我昨天吃了一个苹果 把它变成各个时态被动语态句子 要原句 1
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