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
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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
单项选择题
______ the rides at the Headland, visitors can take a cable car to the Lowland.
A．Enjoying
B．Enjoyed
C．To enjoy
D．Having enjoyed
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