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          Nothing can be done _______  he returns.
          A．a(chǎn)sB．beforeC．whileD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：什么都不能做直到他回來。A作為B在...之前C當(dāng).....時候D直到。Nothing否定詞，什么都沒有。before 引導(dǎo)的從句中謂語動詞不用否定式。此處相當(dāng)與not ...until直到....才。。故選D.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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