单项选择题

There are no less than 3,000 students ______ Chinese here.

A．study
B．to study
C．studied
D．studying
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单项选择题
Before we moved to America, we ______ in Australia for ten years.
A．lived
B．living
C．had lived
D．have lived
单项选择题
For your own ______, please fasten your belts before the plane takes off.
A．safeguard
B．save
C．safety
D．safenor
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