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          Feathers are very light,       we say "as light as a feather".
          A．in caseB．unlessC．ifD．so that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D 

          試題分析：考查連詞：A.in case以防，B.unless除非，C．if如果，D.so that因此，句意：羽毛很輕，因此我們說輕如鴻毛，選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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