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				 -- What’s Carol doing?  --  She’s busy         letters.  A. writing      B. write             C.  wrote        D.  to write			【查看更多】
			


		
           
          


		
          
		
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          —What's Carol doing? 
          —She's busy ______ letters. 
          

          [     ]
          A. writing 
          B. write
           C. wrote 
          D. to write 
          

			
          
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          — What’s Carol doing?
            
          — She’s busy _____________ letters.
            
          A. writing          B. write            C. wrote           D. to write
          

			
          
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