新东方考研语法讲堂76

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2、将下列句子变成主动语态：
    1）What were you told to do?
    What did they tell you to do?
    2）They were made to learn the poem by heart.
    The professor made them learn the poem by heart.
    3）The house was being cleaned while the dinner was being cooked.
    He was cleaning the house while she was cooking the dinner.
    4）It must have been done by an artist.
    An artist must have done it.
    5）The business has been taken over by his competitors.
    His competitors have taken over the business.
    6）Such customs should be done away with.
    We should do away with such customs.
    7）Why haven't the letters been written?
    Why haven't you written the letters?
    8）It must be done at once.
    You must do it at once.
    9）I ought to have been told sooner.
    You ought to have told me sooner.
    10）I wasn't told that he had been dismissed.
    They didn't tell me that they had dismissed him.