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
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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
单项选择题
Now, she is upstairs ______ a long speech for the president.
A．preparing
B．was preparing
C．prepared
D．to prepare
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