单项选择题

The police are suspicious his word because he already has a record. ________.

A．to
B．at
C．on
D．of
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单项选择题
To prevent flooding in winter the water flowing from the dam is constantly ________ by a com- puter.
A．graded
B．managed
C．conducted
D．monitored
单项选择题
The elderly Russians find it hard to live on their state ________.
A．pensions
B．earnings
C．salaries
D．donations
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