题目内容：

He often helps his mother____the housework.A to do B do C with D A,B and C

优质解答

应该选D,因为help sb (to) do sth ：帮助某人做某事.help sb with sth：帮助某人在某方面,故A/B/C选项都正确,因此选D

追问：

help sb with sth是怎么用的？

追答：

帮助某人在某方面，如：他在数学方面帮助我：He helps me with math