what do sam have?he has a tin of chicken.

题目

what do sam have?he has a tin of chicken.
what (do) sam have?he (has) (a) tin of chicken.
这是一个改错题,在括号中的一个里有一个是错误的~所以请大家帮帮~找出来了顺便告诉我怎么改啊~`

答案

do改成does