问题补充：
the project, the young man has little time for entertainment.
A. Devoted to work on
B. Devoted himself to work on
C. Devoted to working on
D. Devoting to work on
答案：
A. Devoted to work on
B. Devoted himself to work on
(答案→)C. Devoted to working on
D. Devoting to work on
解析：考查形容词短语做原因状语。be devoted to(介词) sth/doing sth…专注于…;
C 项=Because he was devoted to working on the project.
