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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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
单项选择题
This old building is ______ in about two weeks.
A．to be pulled down
B．to have pulled down
C．pull down
D．pulling down
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