单项选择题

Dr. Bethune ______ the hospital until the operation was over.

A．left
B．had left
C．didn't leave
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单项选择题
There are so many kinds of radios in the shop. I can't decide ______.
A．to buy what
B．to buy which
C．which to buy
单项选择题
Please come to my home ______ you are free tomorrow.
A．so
B．or
C．if
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