单项选择题

—The light in the office is still on.
—Oh ,I forget ()

A. turning it off
B. turn it off
C. to turn it off
D. having turned it off

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单项选择题
—I usually go there by train. —Why not()by boat for a change

A. to try going
B. trying
C. to try and go
D. try going
单项选择题
—Car 17 won the race. — Yes ,but its driver came close to()

A. having been killed
B. have been killed
C. be killed
D. being killed
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