单项选择题

For your own ______, please fasten your belts before the plane takes off.

A. safeguard
B. save
C. safety
D. safener
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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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