单项选择题

Research has ______ that smoking causes lung cancer.

A．directed
B．indicated
C．judged
D．resulted
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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
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
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