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          【題目】You can’t use the computer now, ________ the upgrade of the system is under way.
          A. untilB. unless
          C. asD. after
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】C
          【解析】
          考查狀語從句的連詞。句意：你現(xiàn)在不能用電腦，因?yàn)橄到y(tǒng)正在升級(jí)。A. until 直到；B. unless 除非；C. as 因?yàn)�，�?dāng)……的時(shí)候；D. after 在……之后。本題是一個(gè)原因狀語從句，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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