单项选择题

Visitors are requested to deposit their bags before entering the exhibition hall.

A．来访者要求带着包进入展览大厅。
B．请参观者进入展览厅之前先把包寄存起来。
C．要求参观者把包存起来，再进入展厅。
D．要求参观者进入会客厅前把包放好。
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