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    科目： 来源：不详 题型：单选题

    Don’t call me at 9:00 o’clock tomorrow morning ,when I          a lecture at Harvard.
    A．giveB．am givingC．will be givingD．am going to give

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    科目： 来源：不详 题型：单选题

    What shall human beings do if oil        sometime in the future?
    A．will run outB．runs out of C．runs outD．will be run out

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    科目： 来源：不详 题型：单选题

    --The window is dirty.
    ----I know. It ______ for weeks.
    A．hasn’t cleanedB．didn’t clean
    C．wasn’t cleanedD．hasn’t been cleaned

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    科目： 来源：不详 题型：单选题

    ---- The battery in my cell phone is running low.
    ---- I _____ that last night before we went to bed.
    A．was noticingB．have noticedC．had noticedD．would notice

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    科目： 来源：不详 题型：单选题

    ----- You seem in low spirits. Anything wrong?
    ----- I ______ in the important exam. I let my parents down.
    A．failB．failedC．has failedD．had failed

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    科目： 来源：不详 题型：单选题

    ——Did you find the missing couple in the mountain yesterday?
    ——No, but we _____ to get in touch with them ever since.
    A．have triedB．have been tryingC．had triedD．had been trying

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    科目： 来源：不详 题型：单选题

    My sister has never played tennis before. This is the first time she __________ to play.
    A．is tryingB．was tryingC．has triedD．had tried

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    科目： 来源：不详 题型：单选题

    Mr. Smith __________ to have a talk with you. He will be here in a minute.
    A．comesB．cameC．has comeD．is coming

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    科目： 来源：不详 题型：单选题

    Since the end of the war, many of the priceless antiques ______ to their rightful owners．
    A．have returnedB．had returned
    C．had been returnedD．have been returned

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    科目： 来源：不详 题型：单选题

    I'm sorry you ______ so long, but it' ll still be some time before Jim gets back．
    A．waitB．waitedC．had waitedD．have been waiting

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