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
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单项选择题
I was always taught that it was ________ to interrupt.
A．rude
B．coarse
C．rough
D．crude
单项选择题
________ the change, a scheduled visit to a factory has been cancelled.
A．Due to
B．But for
C．In spite of
D．With regard to
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