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				28．This river has changed its course many times . It         always located where it       at present.     A. isn’t; is    B. isn’t; will be    C. wasn’t; is    D. wasn’t; has been			【查看更多】
			


		
     
    


		
    
		
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    This river has changed its course many times. It _________ always located where it ________ at present.
      
    A．isn’t; is       B．isn’t; will be      C．wasn’t; is         D．wasn’t; has been
    

			
    
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    This river has changed its course many times．It ________ always located where it ________ at present．

    1. A.
      isn’t; is
    2. B.
      isn’t; will be
    3. C.
      wasn’t; is
    4. D.
      wasn’t; has been
    

			
    
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    This river has changed its course many times．It ________ always located where it ________ at present．
    

    

    [　　]
    

    A．isn’t; is
    

    

    B．isn’t; will be
    

    

    C．wasn’t; is
    

    

    D．wasn’t; has been
    

    

    

			
    
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    This river has changed its course many times．It ________ always located where it ________ at present．
    

    

    [　　]
    

    A．isn’t; is
    

    

    B．isn’t; will be
    

    

    C．wasn’t; is
    

    

    D．wasn’t; has been
    

    

    

			
    
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    This river has changed its course many times．It ________ always located where it ________ at present．
    

    

    [　　]
    

    A．isn’t; is
    

    

    B．isn’t; will be
    

    

    C．wasn’t; is
    

    

    D．wasn’t; has been
    

    

    

			
    
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