单项选择题

The difficulty lies（）their lack of money.

A. in
B. to
C. on
D. with

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单项选择题

They（）the dust by having double windows.

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

单项选择题

Officers are entitled（）travel first class.

A. for
B. with
C. to
D. of

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