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    I hear our teacher will be back            three weeks' time.
        
         A.  at           B.  in                   C. for                 D. after
        
    			
    


			
    

		
    
		
		
	
    
		
    
			
    
				
    
				
    B 
        
    【解析】選B�？疾榻樵~用法。at 一般加時間點；in  +一段時間表示將來時；for加一段時間，通常用于完成時；after通常用于引導(dǎo)過去時的從句。由will提示，應(yīng)該選B。
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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