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    科目： 来源：不详 题型：单选题

    The doorbell had been ringing for several minutes before it ______.
    A answered       B had answered          C was answering       D was answered

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    科目： 来源：不详 题型：单选题

    The notice ______ “No smoking”.  A is told     B reads          C tells      D is read

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    科目： 来源：不详 题型：单选题

    -- Look! Everything here is under construction.
    --- What’s the pretty small house that ______ for?
    A．is being builtB．has been built
    C．is builtD．is building

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    科目： 来源：不详 题型：单选题

    I first met Mr. Smith in America. He ______ at Stanford University then.
    A．studiedB．has studied
    C．is studyingD．was studying

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    科目： 来源：不详 题型：单选题

    It’s been over a year since I ______ back from the countryside.
    A．come B．cameC．will comeD．had come

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    科目： 来源：不详 题型：单选题

    --- What ______ when I phoned you?
    --- I ______ my work, and I wanted to go out.
    A．have you done; finished
    B．were you doing; have finished
    C．did you do; had just finished
    D．were you doing; had just finished

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    科目： 来源：不详 题型：单选题

    --- Why? Tom, your shirt is so dirty!
    --- Mum, I ______ my storeroom downstairs.
    A．cleanedB．have cleaned
    C．was cleaningD．have been cleaning

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    科目： 来源：不详 题型：单选题

    I know Mr. Brown; we ______ to each other at an international conference.
    A．are introducedB．are been introduced
    C．were introducedD．had been introduced

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    科目： 来源：不详 题型：单选题

    Don’t bother to look for my dictionary --- it ______ some day.
    A．turns upB．has turned up
    C．will turn upD．is going to turn up

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    科目： 来源：不详 题型：单选题

    --- What do you think of this kind of TV set, which ______ in Shanghai?
    --- Well, I don’t care about such things.
    A．was madeB．is made
    C．has been madeD．had been made

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