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    科目： 来源：不详 题型：单选题


    Although the causes of cancer ____we do not yet have any practical way to prevent it.
    A．are being uncoveredB．have been uncovering
    C．are uncoveringD．have uncovered

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    科目： 来源：不详 题型：单选题


    5.―Have you handed in your schoolwork yet?
    　―Yes，I have. I guess it ____ now.
    A．has gradedB．is gradedC．is being gradedD．is grading

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    科目： 来源：不详 题型：单选题


    一Have you handed in your schoolwork yet?
    一Yes,I have.I guess it _____ now.
    A．has gradedB．is graded
    C．is being gradedD．is grading

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    科目： 来源：不详 题型：单选题


    Since 1 won the big prize，my telephone hasn’t stopped ringing. People____to ask how I am going to spend the money.
    A．phoneB．will phone
    C．were phoningD．are phoning

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    科目： 来源：不详 题型：单选题

    let’s go out now. It _____ any more.
    A．didn’t rainB．doesn’t rainC．won’t rainD．isn’t raining

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    科目： 来源：不详 题型：单选题

    — ________ for the glass! —It’s OK. I’m wearing shoes.
    A．Look outB．Walk out
    C．Go outD．get out

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    科目： 来源：不详 题型：单选题

    We’re going to ________ with some friends for a picnic. Would you like to join us?
    A．get inB．get over
    C．get alongD．get together

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    科目： 来源：不详 题型：单选题

    They say the snow will ________ until the end of next week.
    A．keepB．last
    C．startD．stay

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    科目： 来源：不详 题型：单选题

    A red sky in the morning _____ to be a sign of bad weather.
    A．saysB．is saying
    C．has saidD．is said

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    科目： 来源：不详 题型：单选题

    New medicines and instruments ______ every day to extend life.
    A．developB．are being developed
    C．are developingD．have developed

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