My mother was busy_?_the housework when i got home横线上填什么,要说明理由

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Mymotherwasbusy_?_thehouseworkwhenigothome横线上填什么,要说明理由Mymotherwasbusy_?_thehouseworkwhenigothome横线上填

My mother was busy_?_the housework when i got home横线上填什么,要说明理由
My mother was busy_?_the housework when i got home
横线上填什么,要说明理由

My mother was busy_?_the housework when i got home横线上填什么,要说明理由
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.

doing
做家务 be busy doing 固定搭配

可以填介词with或者动词doing
因为 be busy with sth.
be busy doing sth.

doing
1.be busy doing 忙于做……
2.do the housework 做家务