The young doctor is determined to devote all his life to the cause of cancer.A. studying

问题补充：

The young doctor is determined to devote all his life to the cause of cancer.

A. studying

B. studied

C. study

D. studies

答案：

(答案→)A. studying

B. studied

C. study

D. studies

解析：考查固定词组：devote all one’s life to doing，一生致力于做…，句意：年轻一生决定一生致力于研究癌症事业。选A。