be busy with sth 与be busy doing sth的区别

答案是：be
busy
doing
sth
意思是：忙于做某事
比如：my
father
is
busy
washing
the
car 爸爸正忙于刷车
be
busy
in
doing
sth
没有在各个词组，be
busy
with
sth
意思是：忙于某事
比如：my
father
is
always
busy
with
his
work
爸爸总是在忙于他的工作

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