单项选择题

To prevent flooding in winter the water flowing from the dam is constantly ______ by a computer.

A．graded
B．managed
C．conducted
D．monitored
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单项选择题
Go and see for yourself, and you ______ what he said is true.
A．would find
B．will find
C．would have found
D．should find
单项选择题
Jefferson always ______ personal investigation before he put forward any suggestion.
A．operated
B．conducted
C．performed
D．practiced
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