单项选择题

After the new technique was introduced, the factory produced ______ cars in 2012 the year before.

A．twice as many; as
B．twice as more; as
C．twice the number of; than
D．twice many; as
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______ no need for us to make a fuss about some minor defects in the week.
A．It has
B．There is
C．It is
D．There has
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You ______ smoke while you re walking around in the wood. You ______ start a fire.
A．might not; can
B．mustn"t; shall
C．mustn"t; could
D．might not; should
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