单项选择题

Another subway has been __________ operation since last December.

A．under
B．in
C．on
D．with
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单项选择题
The __________ of X-rays in 1895 was an important development in the history of medicine.
A．discovery
B．invention
C．arrival
D．origin
单项选择题
The lady was __________ of the quality of the service.
A．entrusted
B．assured
C．confirmed
D．guaranteed
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