–How long ______ the book be kept?
--For two weeks, but you ______ return it on time.
A. can; may B. may; need C. can; must D. must; need
–How long ______ the book be kept?
--For two weeks, but you ______ return it on time.
A. can; may B. may; need C. can; must D. must; need
C