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    科目： 来源：不详 题型：单选题

    — Tony, are you listening to me?
    —Sorry, Sir. I ______ to figure out what you said just now.
    A．was tryingB．have triedC．triedD．had tried

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    科目： 来源：不详 题型：单选题

    —Come on，Kitty.
    —Oh, good heavens! Both my legs are nearly to give out. I_______ for hours like a dog.
    A．have been walkingB．had walkedC．was walkingD．walked

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    科目： 来源：不详 题型：单选题

    In the school hall, where a meeting       , some students are busy preparing for it.
    A．is held B．has been heldC．is being heldD．is to be held

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    科目： 来源：不详 题型：单选题

    Mr. Lee, who        as a guide for over 10 years, is now a manager in a big travel agency.
    A．workedB．has workedC．had workedD．works

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    科目： 来源：不详 题型：单选题

    The scientist __________ the experiment for half a year, but he _______ yet.
    A．made; didn’t succeedB．made; hasn’t succeeded
    C．was making; didn’t succeedD．has been making; hasn’t succeeded

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    科目： 来源：不详 题型：单选题

    It’s high time that we _____ measures to stop selling polluted vegetables.
    A．must takeB．take C．tookD．will take

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    科目： 来源：不详 题型：单选题

    Social attention should be paid          our earth from        .    
    A． to prevent; being pollutedB． to preventing; polluted　
    C． to prevent; pollutingD． to preventing; being polluted

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    科目： 来源：不详 题型：单选题

    When and where to build the new factory ___ ________ yet.
    A．is not decidedB．are not decided
    C．has not decidedD．have not decided

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    科目： 来源：不详 题型：单选题

    According to the statistics, although more books ________ in recent years, Chinese people spend ________ time in reading.
    A．have been come out; littleB．have come out; less
    C．have come out; littleD．have been come out; less

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    科目： 来源：不详 题型：单选题

    —I haven’t finished my essay because the computer broke down when I was downloading the required data last night.
    —Really! You could have turned to me. I         mine.
    A．didn’t useB．won’t useC．hadn’t usedD．wasn’t using

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