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    科目： 来源：陕西省同步题 题型：单选题

    Look at the sweat on her face. She________the house since she got up this morning.
    [     ]
    A. is cleaning  
    B. has been cleaned
    C. was cleaning  
    D. has been cleaning

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    科目： 来源：天津同步题 题型：单选题

    Mother wanted to be a good provider, a role she________since her marriage to Father.
    [     ]
    A. shoulders    
    B. shouldered
    C. is shouldering  
    D. has been shouldering

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    科目： 来源：福建省同步题 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 tried  
    B. have been trying
    C. had tried  
    D. had been trying

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    科目： 来源：福建省同步题 题型：单选题

    One of my high school friends________in London ever since she moved there in 1998.
     [      ]
    A. lived  
    B. is living
    C. lives  
    D. has been living

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    科目： 来源：陕西省同步题 题型：单选题

    The secretary________letters all the afternoon and there are still two letters to finish.
    [      ]
    A. is typing 
    B. had type
    C. has been typed
    D. has been typing

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    科目： 来源：内蒙古自治区模拟题 题型：单选题

    Unrest and violence in North Africa and the Middle East ____ at their fastest rate since 2008.  
     [     ]
    A. have been raising    
    B. have been rising
    C. have raised        
    D. have risen

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    科目： 来源：模拟题 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：模拟题 题型：单选题

    — Hi, Jack!When did you arrive in Berlin?
    — Last weekend. I  __________  a different culture since then.
    [      ]
    A. was experiencing                
    B. will be experiencing
    C. have been experiencing            
    D. had been experiencing

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    科目： 来源：江西省高考真题 题型：单选题

    Mother wanted to be a good provider, a role she ______ since her marriage to Father.
    [     ]
    A. shoulders
    B. shouldered
    C. is shouldering
    D. has been shouldering

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    科目： 来源：江苏高考真题 题型：单选题

    — I'm sure Andrew will win the first prize in the final.
    — I think so. He ______ for it for months.
    [     ]
    A. is preparing
    B. was preparing
    C. had been preparing
    D. has been preparing

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