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    科目： 来源：期中题 题型：单选题

    Scientists overcame (克服) much difficulty they had _____ that technological problem _____ they finally
    could send the manned (载人的) spaceship up into space.
    [     ]
    A. to solve; until
    B. solving; before
    C. to solve; before
    D. solving; until

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    科目： 来源：河北省模拟题 题型：单选题

    _____ he opened the window, a sparrow flew in.
    [     ]
    A. Though
    B. The moment
    C. If
    D. Unless

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    科目： 来源：河南省模拟题 题型：单选题

    They didn't discover until they happened to enter the back room ______ someone had stolen the
    priceless painting.
    [     ]
    A. that
    B. what
    C. which
    D. when

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    科目： 来源：山东省模拟题 题型：单选题

    ______ I admit that the problems are difficult, I don't agree that they can't be solved.
     [      ]
    A. In case
    B. While  
    C. As      
    D. Because

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    科目： 来源：四川省期中题 题型：单选题

    As is well known to us students, it is 104 years        our school was founded.
     [     ]
    A. when        
    B. before        
    C. after            
    D. since

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    科目： 来源：浙江省期中题 题型：单选题

    The roads are crowded ______ walking to work is even quicker than driving.
    [     ]
    A. in order that  
    B. in order to  
    C. so as to  
    D. so that

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    科目： 来源：浙江省期中题 题型：单选题

    Experts believe that it will be five or six years ______ the price of houses becomes acceptable
    for ordinary families.
    [    ]
    A. since        
    B. after         
    C. before      
    D. until

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    科目： 来源：四川省模拟题 题型：单选题

    _______ China implements (实施) its control over the disputed regions, can its sovereignty
    and interests be defended.
    [     ]
    A. If only  
    B. Even if
    C. Only if       
    D. As if

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    科目： 来源：四川省模拟题 题型：单选题

    But it will be more than 100years _______ the country begins once again to look as it did before.  
    [      ]
    A. since    
    B. that    
    C. when    
    D. before

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    科目： 来源：四川省模拟题 题型：单选题

    — Hasn't the thief admitted his crime by now?  
    — No, ______ questioned many times.       
    [     ]
    A. if              
    B. though        
    C. unless          
    D. once

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