My mother was busy_?_the housework when i got home横线上填什么,要说明理由
问题描述：
My mother was busy_?_the housework when i got home
横线上填什么,要说明理由
答
doing
1.be busy doing 忙于做……
2.do the housework 做家务
答
可以填介词with或者动词doing
因为 be busy with sth.
be busy doing sth.
答
doing
句意为当我到家时,我妈妈正在忙于做家务.
be busy doing为固定搭配.
答
doing
做家务 be busy doing 固定搭配