单项选择题

The policeman was in plain clothes, watching for a______character at the airport all night.

A. suspicious
B. suspect
C. susceptible
D. doubtful
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There ought to be less anxiety over the perceived risk of mountain climbing than______in the public mind today.
A. exists
B. exist
C. exiting
D. to exist
单项选择题
We met the young couple at a party three weeks ago.______we've had no further communication.
A. Thereof
B. Thereby
C. Thereafter
D. Thereabouts
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