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    科目： 来源：北京模拟题 题型：单选题

    You can get to your destination earlier ______ you don't mind taking the night train.  
    [      ]
    A. if    
    B. unless    
    C. though    
    D. until

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    科目： 来源：河北省模拟题 题型：单选题

    You can't appreciate happiness _______ you have known sadness too.   
    [     ]
    A. because          
    B. when          
    C. though            
    D. unless

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    科目： 来源：山东省模拟题 题型：单选题

       __  it was hard for children to leave family and friends, many families chose to send their children
    to America.    
    [     ]
    A. Because
    B. Although    
    C. If    
    D. As

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    科目： 来源：上海模拟题 题型：单选题

    Scientists estimate that plants and animals lived _____ 3.5 billion years ago.
    [     ]
    A. as far as
    B. as many as
    C. as long as
    D. as old as

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    科目： 来源：上海模拟题 题型：单选题

    Facing a beggar, I may feel this poor person needs help, and the need will not be met _____ I put my
    hand in my pocket now.
    [      ]
    A. since
    B. in case
    C. unless
    D. while

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    科目： 来源：上海模拟题 题型：单选题

    _____ you've tried it, you can't imagine how tasty the fish I cooked is.  
    [     ]
    A. Because      
    B. Unless        
    C. Although      
    D. So long as

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    科目： 来源：上海模拟题 题型：单选题

    It has come to be realized ______ particular matters in the air expose us to life's real danger.
    [     ]
    A. what      
    B. which      
    C. when          
    D. that

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    科目： 来源：四川省月考题 题型：单选题

    He made a mistake, but then he corrected it _____ it got worse.
    [     ]
    A. until    
    B. when    
    C. before    
    D. as

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    科目： 来源：广西自治区期中题 题型：单选题

    ______the bad weather, they finished all the work on time.  
    [      ]
    A. Though  
    B. Because of  
    C. No matter how  
    D. Despite

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    科目： 来源：海南省期中题 题型：单选题

    — Some Chinese students find it hard to get used to the life in London.  
    — Exactly, ______ they've learnt a lot about the city before.
     [     ]
    A. if
    B. now that
    C. as though
    D. even though

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