单项选择题

I think (that) the day (will) finally come (that) air pollution can be put (C) control.

A．that
B．will
C．that
D．under
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单项选择题
His salary as a bus driver is much higher ______
A．in comparison the salary of a teacher
B．than a teacher
C．than that of a teacher
D．to compare as a teacher
单项选择题
Every means ______ but without much result.
A．have been tried
B．has been tried
C．have tried
D．has tried
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