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          Actions ______ be taken to stop H7N9 from spreading again.
          A．mustB．mayC．can’tD．needn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意:必須馬上采取行動(dòng)來(lái)阻止Ｈ７Ｎ9 再次蔓延。take actions to do sth. 意為：采取行動(dòng)做某事，這里用了這個(gè)句型的被動(dòng)形式。根據(jù)句意可知，H7N9這個(gè)病毒傳播的很快，故我們必須馬上采取行動(dòng)，這里的語(yǔ)氣是非常強(qiáng)硬的，故用must,必須。may 可以；can’t 不能，不會(huì)；needn’t 不必要。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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