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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