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
By the end of last year we ______ over 2,000 English phrases.
A. have learned
B.learned
C. wiU have learned
D. had learned
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