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
--How long ______ you ______ the bicycle --About two weeks.
A． have; had
B． have; bought
C． did; buy
单项选择题
I think computer ______ in everyday life before long.
A． will use
B． will be used
C． is used
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