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           The director wants to make sure no one will solve the mystery until it ________ at the end of the horror film. 
          A．is explained B．will be explained C．explains　 D．has explained 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          

          解析試題分析：句意：導(dǎo)演想確保在這部恐怖片的末尾揭示真相之前沒(méi)有人能夠破解這個(gè)謎團(tuán)。Until引導(dǎo)的時(shí)間狀語(yǔ)從句用一般現(xiàn)在時(shí)來(lái)表達(dá)將來(lái)時(shí)，it和explain存在著邏輯上的動(dòng)賓關(guān)系；所以用被動(dòng)結(jié)構(gòu)；故選A。
          考點(diǎn)：考查時(shí)態(tài)和語(yǔ)態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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