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          I worked on the problem ____ a long time and I worked it out ____ myself ____ last.

          A. for; by; at 
          B. in; with; on 
          C. on; by; in 
          D. for; for; at the 
          			
          

			
			
			
		
          



							
          
				相關習題
			
          	
						
          
			
          
				科目：初中英語
				來源：專項題
				題型：單選題
			
          
									
          I worked on the problem ____ a long time and I worked it out ____ myself ____ last.
          

          [     ]
          A. for; by; at 
          B. in; with; on 
          C. on; by; in 
          D. for; for; at the 
          

			
          
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