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--- You didn't lock the back door.

    --- You are wrong. I ______.

   A. have locked it        B. lock it myself      C. did lock it     D. do lock it

― You didn't lock the back door.

― You are wrong. I ______      

A. have locked it         B. lock it myself          C. did lock it                      D. do lock it

― You didn't lock the back door.  

― You are wrong. I ______                  

A. have locked it        B. lock it myself        C. did lock it                    D. do lock it  

 —You didn't lock the back door.   

— You are wrong. I _______.

   A. have locked it        B. lock it myself      C. did lock it          D. do lock it