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          —We can’t be successful ________ we keep working hard.
          —I agree with you.      
          A．if B．unlessC．because D．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          if是否，如果；unless除非，如果不；because因為；when既然，當(dāng)……時。句意：如果我們不努力工作，我們就不能成功�！彝饽愕目捶�。結(jié)合語境可知選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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