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    -Did you attend your son's graduation ceremony yesterday? - I , but I had to go to an important meeting. A．used to B．ought to C．must have D．should have 【查看更多】

     

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    ―Did you attend your son's graduation ceremony yesterday?

    ― I______, but I had to go to an important meeting.

           A．used to          B．ought to           C．must have           D．should have

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    －Did you attend your son's graduation ceremony yesterday?

    －I ________, but I had to go to an important meeting．

    [　　]

    A．used to

    B．ought to

    C．must have

    D．should have

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