The last five digits of Zoe\textquotesingle s phone number are $3,4,8,5,7.$ If these $5$ digits are filled in the square~$$\huge\square+\square =\square +\square $$, which number is not used?~(adapted from $$2017$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$8$$) 
选项为:A:$$3$$  B:$$4$$  C:$$5$$  D:$$7$$  E:$$8$$  请回答其中一个选项.