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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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热门试题

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