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    • 不定式中含有to have been通常保留have been,请举几个例句

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    推荐答案   2020-07-10
    如果不定式中含有be, have, have been,通常保留be, have和have been.如：
    —Are you a sailor?
    __No, but I used to be.
    __He hasn’t finished his homework yet.
    __Well, he ought to have.

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