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题目
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 birthday.

提问时间:2020-07-30

答案
1.The pupils at school are kept for a revision by the teacher.2.The article must be finished by you before Friday.3.Mary was promised a new doll for her birthday by them.
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