My sister often helps my Mum______(clean)the house.

问题描述:

My sister often helps my Mum______(clean)the house.

3楼很全面了

clean

clean或者是to clean
因为有两个句型:help sb.do sth.
help sb.to do sth.
意思没有什么差别

可以加to 也可以不加 是固定短语 help with