【题目】Considering his poor health, the doctor insisted on his ________ a good rest before going back to work.
A. being taken B. having taken
C. taken D. taking
在线课程【答案】D
【解析】句意：考虑到他糟糕的健康状况，医生坚持要他在回去工作之前好好休息一下。insist on doing sth.意为“坚持做某事，坚决要求做某事”。故选D。