单项选择题

They（）the dust by having double windows.

A. put down
B. shot out
C. cut short
D. taken off

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单项选择题
Officers are entitled（）travel first class.

A. for
B. with
C. to
D. of
单项选择题
It is quite（）that he will change his mind.

A. sure
B. right
C. exact
D. certain
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