For many of us, work, school, family, and community obligations have already occupied a large portion of our lives, leaving us little time for things that we enjoy (31)___________ .
For many of us, work, school, family, and community obligations have already occupied a large portion of our lives, leaving us little time for things that we enjoy (31)___________ .
A. doing
B. to doing
C. to do
D. do