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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By the end of last year we ______ over 2,000 English phrases.
A. have learned
B. learned
C. will have learned
D. had learned
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Ten years ______ since we met in Beijing.
A. passed
B. passing
C. have passed
D. had passed
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