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          I ________ when the UFO landed.
          A．a(chǎn)m watching TVB．was watching TV
          C．have watched TV D．watched TV
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          本題的從句是過(guò)去時(shí)，故主句應(yīng)該是過(guò)去時(shí)的一種，本題的含義是UFO著落的當(dāng)時(shí)我做的事情應(yīng)該是正在發(fā)生，故用過(guò)去進(jìn)行時(shí)，結(jié)構(gòu)為was或were+doing，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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