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          ---How often do I need to feed the birds?
          ---They______ food every day, or they will be hungry.
          A．must giveB．mustn’t give
          C．must be givenD．mustn’t be given
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意: 我需要多久喂一次鳥？必須每天喂食他們，否則他們會餓的。主語they 是動作give的承受者，所以句子用被動語態(tài)be given，故排除A B 項。帶情態(tài)動詞的被動語態(tài)基本結(jié)構(gòu)：情態(tài)動詞+be +動詞的過去分詞，must be given必須喂，mustn’t be given一定不要喂。據(jù)題意選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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