题干
—Excuse me, sir, visiting hours are over. You leave.
—Pardon me, nurse. I didn't hear the bell.
A：may
B：can
C：must
D：need
答案(点此获取答案解析）
C
—Excuse me, sir, visiting hours are over. You leave.
—Pardon me, nurse. I didn't hear the bell.
A：may
B：can
C：must
D：need
