单项选择题

The secret agent kept looking back because he was afraid of ______.

A. followed
B. being followed
C. having followed
D. having been followed
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单项选择题
The ______ horse ran away from the fire.
A. having frightened
B. frightening
C. frightened
D. frighten
单项选择题
Shall I turn on the television -- No, I'd rather not ______ television tonight.
A. have watched
B. to watch
C. watch
D. for watching
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