which is right:9 and 5 is 13 or 9 and 5 are 13?
问题描述：
which is right:9 and 5 is 13 or 9 and 5 are 13?
答
9 and 5 is 13
前面的主语后跟单数,
也可以用9 plus 5 equals 13
说明：
9加5应该是14呀,