when i got home ,mum was busy ___cooking in the kitchen

when i got home ,mum was busy ___cooking in the kitchen

题目
when i got home ,mum was busy ___cooking in the kitchen
A.with
B.with doing
可是我不懂的是be busy with doing sth,这里cooking 已经是动词,为什么还要加doing
答案
动词叫ing形式同样有名词的功能,正确的搭配就是be busy with sth和be busy with doing sth
cooking这里就是充当的名词的功能,而cook是厨师的意思,所以这里只能用第二种搭配be busy with doing sth
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