Dr. Ma used to            two or three persons in the hospital.
#49403
A
operate on
B
operating on
C
operate for
D
operating for
推荐题目
Good weather, isn't it? Let's___a walk through the park.
#49572
A
take
B
takes
C
taking
D
to take
I want ___ a policeman because it is an exciting ____.
#51250
A
to be , job
B
doing , work
C
to do , job
D
be , work
Could you please not ____________ here? 
#50841
A
smoking
B
smoke
C
to smoke
D
smoked