单项选择题

Millions of Americans flock to their drugstore 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
If they had sent a check to the telephone company last week, their telephone （）out of service at this moment.

A．will not be
B．will not have been
C．would not be
D．would not have been
单项选择题
The extensive survey suggested that their assumptions （）totally wrong.

A．were
B．be
C．was
D．would be
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