来访人员必须在前台登记吗？
Must visitors sign in at the front desk?
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must英 /mʌst/|美 /mʌst/
解释
must 置于句首构成疑问句，询问规则性义务
Must visitors sign in at the front desk?
must 置于句首构成疑问句，询问规则性义务