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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单项选择题
You cannot be _____careful when you drive a car.
A．very
B．so
C．too
D．enough
单项选择题
So many directors_____, the board meeting had to be put off.
A．were absent
B．been absent
C．had been absent
D．being absent
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