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				       your test paper carefully, some mistakes can certainly be avoided, I think.    A. Having checked   B. Check      C. As long as you check D. While checking			【查看更多】
			


		
     
    


		
    
		
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    _____ your test paper carefully, some mistakes can certainly be avoided, I think. 
     A. Having checked  B. Check       C. As long as you check D. While checking    
     
     
    

			
    
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