单项选择题

The ______ professor entered our classroom to give us a lecture after the bell rang.

A．respectful
B．respected
C．respecting
D．respective
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单项选择题
There are no less than 3,000 students ______ Chinese here.
A．study
B．to study
C．studied
D．studying
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
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