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				7．A．for            B．in            C．a(chǎn)t            D．since			【查看更多】
			


		
     
    


		
    
		
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    The factory opened ________ 1989.
    

    [　　]
    

    

    A．for
    B．since
    

    C．in
    D．a(chǎn)t
    

    

    

			
    
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    She won her first gold medal ________ 1991.
    

    [　　]
    

    

    A．for
    B．a(chǎn)t
    C．in
    D．since
    

    

    

			
    
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    He has worked in the factory______ five years ago．
      
    A． for         B． at         C． since          D． about
    

			
    
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    I've waited _________an hour and now I'm leaving.
    

    [　　]
    
    

    

    

    A．since
    		


    B．in
    		

    

    

    C．at
    		


    D．for
    		

    

    

    

			
    
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    His grandpa has been ill ______ a few days.
    

    [　　]
    
    

    

    

    A．in
    		


    B．since
    		


    C．at
    		


    D．for
    		

    

    

    

    

			
    
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