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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单项选择题
By the end of last year we ______ ever 2,000 English phrases.
A. have learned
B. learned
C. will have learned
D. had learned
单项选择题
______ the meat on the gas cooker, he began to watch TV.
A. Put
B. Putting
C. Being put
D. Having put
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