Using $$7$$, $$6$$, $$5$$, $$4$$ in order and addition and subtraction signs we can make $$10$$, as shown below.  $$7-6+5+4=10$$  Fill in the gaps below with either addition or subtraction signs to make $$12$$.  $$7$$~ ~ ~ $$6$$~ ~ ~ $$5$$~ ~ ~ $$4$$~ ~ ~ $$=12$$ 
选项为:A:$$+$$，$$-$$，$$+$$  B:$$+$$，$$+$$，$$+$$  C:$$-$$，$$-$$，$$-$$  D:$$-$$，$$+$$，$$-$$  请回答其中一个选项.