单项选择题

A．The usher.
B．The people sitting next.
C．The people sitting in front of him.
D．The people standing in the back.
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单项选择题
A．Watch traffic.B．Obey commands.C．Cross streets safely.D．Guard the door.
A．Watch traffic.
B．Obey commands.
C．Cross streets safely.
D．Guard the door.
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