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

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Atthatmoment,lsawthedoctorwasbusy__hiswork.a.todob.withc.didd.forAtthatmoment,lsawthedoctorwasbusy__

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

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

be busy with sth 忙于....
综上,选B

with