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
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It was not until 1920 ________ regular radio broadcasts began.
A．while
B．which
C．that
D．since
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Not only I but also Jane and Mary ________ tired of having one exam after another.
A．is
B．are
C．am
D．be
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