【题目】Jackie ________ voluntary work ever since he graduated from college.
A. was devoted to B. devoted to
C. has been devoted to D. had devoted to
在线课程【答案】C
【解析】考查时态。句意：自从Jackie大学毕业后，他一直投身于志愿者工作。根据句中的since可知主句应该用现在完成时，表示动作从过去持续到现在。be devoted to表示“专心于，致力于…；献身…”，故选C。