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          Everyone can borrow from this public library only two books _____ and they must be returned within a month.
          A．a(chǎn)t one timeB．a(chǎn)t timesC．a(chǎn)t the timeD．a(chǎn)t a time
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          本題的含義是每個(gè)人每次可以在圖書館借2本書，他們必須在一個(gè)月內(nèi)歸還。at a time可以表示一次或每次的意思，故本題選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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