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    科目： 来源：同步题 题型：单选题

    Ever since the Greens moved to the country a year ago, they________better health.
    [     ]
    A. are enjoying  
    B. have been enjoying
    C. could have enjoyed  
    D. had enjoyed

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    科目： 来源：同步题 题型：单选题

    The little boy________in the mud all morning.No wonder he is dirty from head to foot.
    [     ]
    A. has played  
    B. is playing
    C. has been playing  
    D. was playing

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    科目： 来源：陕西省同步题 题型：单选题

    I ________ glasses since I was in primary school and I hate them. They make me look like a bookworm.
    [      ]
    A. have worn  
    B. have been wearing
    C. have been worn  
    D. was wearing

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    科目： 来源：同步题 题型：单选题

    He________English since he graduated from college and he is now even more interested in teaching it.
    [     ]
    A. taught    
    B. was teaching
    C. has been teaching  
    D. had taught

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    科目： 来源：同步题 题型：单选题

    -Hi，Tracy，you look tired.
    -I________the living room for three hours.
    [     ]
    A．paint    
    B．had painted
    C．was painting  
    D．have been painting

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    科目： 来源：同步题 题型：单选题

    The little boy ________  in the mud all the morning. No wonder he is dirty from head to foot.
    [     ]
    A．has played  
    B．is playing
    C．has been playing  
    D．was playing

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    科目： 来源：同步题 题型：单选题

    -That's the third time he's won the award in this field.
    -Yes. He ________ his maximum potential in the past decade.
    [     ]
    A．explored  
    B．is exploring
    C．has been exploring  
    D．has explored

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    科目： 来源：同步题 题型：单选题

    I have to see the doctor because I ________ a lot lately.
    [     ]
    A. have been coughing  
    B. had coughed
    C. coughed  
    D. cough

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    科目： 来源：同步题 题型：单选题

    Joseph ________ to evening classes since last month, but he still can't say "What's your name?" in
    Russian.

    [     ]
    A. has been going  
    B. went
    C. goes  
    D. has gone

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    科目： 来源：同步题 题型：单选题

    —Those scientists invented a robot to care for kids!
    —It's not surprising. They ________ wonders all the time.
    [     ]
    A. worked
    B. were working
    C. work
    D. have been working

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