单项选择题

By the year 2000, production in the area is to double ______ of 1990.

A．that
B．it
C．one
D．what
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单项选择题
It's time __ about the noise pollution late at night.
A．something will be done
B．everything is done
C．something was done
D．everything will be done
单项选择题
The river was______ with waste from that factory. Some measures must be taken to stop its production.
A．corrupted
B．consumed
C．contaminated
D．infected
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