单项选择题

Nobody but Sam and Tom ______ in the lab.

A．are
B．have been
C．were
D．is
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单项选择题
This year we will produce ______ they did last year.
A．as twice many cars as
B．twice as many than cars
C．twice as many cars as
D．cars twice many that
单项选择题
Busy ______ he is, he can finish the task ahead of schedule.
A．because
B．as
C．no matter how
D．although
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