单项选择题

Would you please __________ the text until you have finished the exercise

A．not to refer to
B．don’t refer to
C．not refer to
D．doesn’t refer to
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单项选择题
Another subway has been __________ operation since last December.
A．under
B．in
C．on
D．with
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
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