单项选择题

The teacher gave me one of the best ______ I had ever heard,

A．piece of advice
B．pieces of advices
C．piece of advices
D．pieces of advice
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单项选择题
If it had not been for the snow, we ______ the mountain yesterday.
A．can have climbed
B．could climb
C．can climb
D．could have climbed
单项选择题
The policeman happened ______ the traffic when the accident happened.
A．to direct
B．directing
C．to be directing
D．to have directed
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