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          When you are planting trees, the trees ________ straight in the hole.
          A．must put B．must be put C．a(chǎn)re putting D．is put 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          

          解析試題分析：句意為：植樹的時候，樹必須直立放到坑里。根據(jù)語境，句子的主語是“the trees”，是動作的承受者，應(yīng)用被動語態(tài)。故選B。
          考點：考查被動語態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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