单项选择题

Our office has recently ______ to a new computer system.

A. altered
B. converted
C. transformed
D. modified
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单项选择题
Slavery was ______ in America in the 19th century.
A. abolished
B. cancelled
C. abandoned
D. terminated
单项选择题
The boys in the dorm （）a coin to decide who would clean the floor.

A. held
B. tossed
C. put
D. collected
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