单项选择题

You'd better keep the windows ______. It's so hot here.

A． open
B． opening
C． opens
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单项选择题
Dr. Bethune ______ the hospital until the operation was over.
A． left
B． had left
C． didn't leave
单项选择题
--How long ______ you ______ the bicycle --About two weeks.
A． have; had
B． have; bought
C． did; buy
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