Mr. Morse, who graduated from a famous medical university, spent years            his skills as a doctor.

A．adapting           B．acquiring          C．occupying           D．concentrating

Mr.Morse，who graduated from a famous medical university，spent years ______ his skills as a doctor.

A．adapting　

B．acquiring

C．occupying　

D．concentrating

Mr.Morse，who graduated from a famous medical university，spent years ______ his skills as a doctor.

1. A.
   adapting
2. B.
   acquiring
3. C.
   occupying
4. D.
   concentrating