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				19．A．when          B．because        C．if             D．though			【查看更多】
			


		
     
    


		
    
		
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    The red suitcase is expensive ______it’s made of leather.
      
    A．when         B．if             C．because          D．though
    

			
    
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    Our math teacher is very kind ______ he looks very
serious.
    


    A．because          B．though            C．if                D．when
    


     
    

			
    
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    Jack spends much money on books ________ he is not so
rich.
    


    A．though           B．when             C．if                D．because
    


     
    

			
    
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    The red suitcase is expensive _________ it's made of leather.
    

    [　　]
    


    

    

    A．when
    		


    B．if
    		


    C．because
    		


    D．though
    		

    

    

    

    

			
    
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    The red suitcase is expensive ________ it's made of leather．
    

    

    [　　]
    

    A．when
    

    

    B．if
    

    

    C．because
    

    

    D．though
    

    

    

			
    
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