I think its A
Which sentence is punctuated correctly?


A.
My doctor told me to be sure to finish taking all of my medicine.


B.


My doctor "told me to be sure to finish taking all of my medicine."


C.
My doctor told me to be sure "to finish taking" all of my medicine.


D.


My doctor told me "to be sure to finish taking all of my medicine."



Answer :

Your guess - A. My doctor told me to be sure to finish taking all of my medicine. - is correct I believe. 

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