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
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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
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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