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          All passengers______go through safety check before they take a plane.
          A．canB．may
          C．mustD．ought
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：can能，能夠；may可以，可能；must必須，一定；Ought應(yīng)該。句意：所有乘客在上飛機(jī)之前都要經(jīng)過(guò)安檢。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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