单项选择题

People appreciate ______with him because he has a good sense of humor.

A．to work
B．to have worked
C．working
D．having worked
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单项选择题
Operations which left patients ______and in need of long periods of recovery time now leave them feeling relaxed and comfortable.
A．exhausted
B．abandoned
C．injured
D．deserted
单项选择题
Millions of Americans flock to their drugstores to buy vitamins and minerals, ______ that these pills can help to prevent serious illnesses.
A．convincing
B．convinced
C．to convince
D．to be convinced
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