单项选择题

It’s time the dog ______ how to behave properly.

A. is learning
B. learns
C. learned
D. to learn
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单项选择题
They wanted to charge $5,000 for the car, ______ we managed to bring the price down.
A. but
B. so
C. when
D. since
单项选择题
We ______ the office where our beloved Premier Zhou once worked.
A. called on
B. called at
C. called in
D. called back
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