At that moment,l saw the doctor was busy__his work.a.to dob.withc.didd.for

分类: 作业答案 • 2022-09-25 17:06:34

问题描述：

At that moment,l saw the doctor was busy__his work.
a.to do
b.with
c.did
d.for

答

with

答

be busy with sth 忙于....
综上，选B

答

with
be busy with sth.