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
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
For your own ______, please fasten your belts before the plane takes off.
A．safeguard
B．save
C．safety
D．safenor
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