单项选择题

The water will be further polluted unless some measures ________.

A．will be taken
B．are taken
C．were taken
D．had been taken
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单项选择题
After the new technique was introduced, the factory produced ________ tractors in 1998 than the year before.
A．as twice many
B．as many twice
C．twice as many
D．twice many as
单项选择题
It was not until 1920 ________ regular radio broadcasts began.
A．while
B．which
C．that
D．since
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