—Mum, can I go to the concert tonight?—Sure, but you _____ finish your homework first. [ ]A. can B.
[ ]
题目简介
—Mum, can I go to the concert tonight?—Sure, but you _____ finish your homework first. [ ]A. can B.
题目详情
—Sure, but you _____ finish your homework first.
[ ]
B. must
C. needn't
答案