单项选择题

The teacher came into the room, with his hands ______ behind his back.

A．being crossed
B．having crossed
C．crossed
D．to be crossed
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单项选择题
Having entered the hall, she found a chair in one corner and ______ herself silently.
A．sitting
B．sat
C．seating
D．seated
单项选择题
They were at work when they received ______ SOS from ______ school, and they immediately started their police cars.
A．the,the
B．a,a
C．an,a
D．the,a
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