2019年第$$24$$届$$YMO$$一年级竞赛决赛第$$6$$题$$3$$分  The sum of the ten digits and the single digit is $$12$$, and there are a total of  such two-digit numbers.  十位数字和个位数字相加的和是$$12$$，这样的两位数一共有个． 
选项为:A:$$5$$  B:$$6$$  C:$$7$$  D:$$8$$  请回答其中一个选项.