问题
选择题
—May I go out now, Dad?
—No. You _____ let your mother know first.[ ]
A. can
B. may
C. need
D. must
答案
答案：D
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—May I go out now, Dad?
—No. You _____ let your mother know first.[ ]
A. can
B. may
C. need
D. must
答案：D