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    科目： 来源：不详 题型：单选题

    Computers ____ in offices and homes since 1970s. 
    A．have been usedB．had been usedC．was usedD．has been used

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    科目： 来源：不详 题型：单选题

    He will have learned English for eight years by the time he        from the university next year．
    A．will graduateB．will have graduated
    C．graduatesD．is to graduate

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    科目： 来源：不详 题型：单选题

    When Mary came, I _____ on the piano.
    A．is playingB．playsC．was playingD．played

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    科目： 来源：不详 题型：单选题

    Japan’s economy _______ in the past twenty years. No one knows how long it ______ before it regains its increase.
    A．has been declining; will beB．has declined; would be
    C．had been in decline; would takeD．was on the decline; will take

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    科目： 来源：不详 题型：单选题

    —I remember I left my laptop in the study last night. Why ________ here?
    —Oh, I thought you might need it so I brought it here for you.
    A．does it comeB．has it comeC．had it comeD．will it come

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    科目： 来源：不详 题型：单选题

    Experiments of this kind ___in both the U．S and Europe well before the Second World War．
    A．had conductedB．have conducted
    C．have been conductedD． had been conducted

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    科目： 来源：不详 题型：单选题

    – Where does your brother work, Jane?
    -- In America. But he __________in China for 5 years.
    A．has been workingB．has worked
    C．workedD．was working

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    科目： 来源：不详 题型：单选题

    The job proved to be much more difficult than I______. 
    A．expectB．expectedC．wouldexpectD．hadexpected

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    科目： 来源：不详 题型：单选题

    Mr. Smith, I should tell you this is the fifth time you ______ me for my twin sister.
    A．have mistakenB．are mistaking
    C．mistookD．are mistaken

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    科目： 来源：不详 题型：单选题

    ---- How about your last weekend?
    ---- It was boring. I______ anything.
    A．can’t doB．hadn’t doC．haven’t doD．didn’t do

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