单项选择题
______no air or water, there would be no life in the world.
A．There was
B．There were
C．Is there
D．Were there
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单项选择题
The country has ______people and ______money ______spent on tobacco every year.
A．a large quantity of, a number of, are
B．plenty of, a great deal, are
C．a great deal of, plenty of, is
D．a large number of, a large amount of, is
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单项选择题
It was 12 o'clock ______the plane took off.
A．when
B．that
C．since
D．till
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