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				  This CD-ROM is quite useful. It can help us learn English and geography         .A.  at times    B.  at this time  C. at the  same time  D. by the time			【查看更多】
			


		
           
          


		
          
		
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          This CD-Rom is quite useful. It can help us learn English and geography _____. 
          

          [     ]
          A. at times 
          B. at this time 
          C. at the same time 
          D. by the time 
          

			
          
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