—Mum, can I go to the concert tonight? —
问题:
—Mum, can I go to the concert tonight?
—Sure, but you _____ finish your homework first. [ ]
A. can
B. must
C. needn't
—Mum, can I go to the concert tonight?
—Sure, but you _____ finish your homework first. [ ]
A. can
B. must
C. needn't