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