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           ---I’ve heard some scientists have sent a spacecraft to Mars. 
           ---Really? Has it arrived _____?
           A already     B yet        C still            D ever
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查副詞辨析。Already已經(jīng)，一般用于肯定句子中間；yet已經(jīng)，一般用于否定句及疑問(wèn)句句尾；still 仍然；ever曾經(jīng)。句意：我聽(tīng)說(shuō)科學(xué)家們已經(jīng)向火星發(fā)射了一艘宇宙飛船。——真的嗎？已經(jīng)到了沒(méi)有？故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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