单项选择题

The offices are located ______ the fourth floor of the Piazza building.

A. on
B. over
C. in
D. at
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单项选择题
According to the latest news ______ on KBCD radio, all traffic on the Pacoma Straits Bridge has been suspended due to gale-force winds.
A. agent
B. publication
C. bulletin
D. letter
单项选择题
Currently Ms. Alonso ______ the performance assessment plan for middle managers.
A. revise
B. is revising
C. has revised
D. revised
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