Finish your homework first;then you’ll ______ surf the Internet for half an hour.
A. can B. need
C. be able to D. may
Finish your homework first;then you’ll ______ surf the Internet for half an hour.
A. can B. need
C. be able to D. may
C can/need/may是情态动词,不能与助动词will连用,故选C。