WHEN SHE RETIRED, SHE DID A LOT OF……. SERVICE FOR THE RED CROSS.A. VOL...

2: - KIEM TRA 45'''' LAN 2 CB
KIEM TRA 45'''' LAN 2 CB

2: When she retired, she did a lot of……. service for the Red Cross.

A. voluntary B. voluntarily C. volunteer D. voluntarism