My mother is busy(?)dinner

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Mymotherisbusy(?)dinnerMymotherisbusy(?)dinnerMymotherisbusy(?)dinnerwith因为bebusywith是个固定短语,忙着干什么事情的

My mother is busy(?)dinner
My mother is busy(?)dinner

My mother is busy(?)dinner
with
因为be busy with 是个固定短语,忙着干什么事情的意思!

with

be busy in忙于做某事

with

be busy doing 是固定搭配
所以应该用 cooking