问题描述：
when did he leave th classroom?he left __ you turned back to
——when did he leave th classroom?
——he left __ you turned back to write on the blackboard.
A.the time B.until C.the minute D.before
——when did he leave th classroom?
——he left __ you turned back to write on the blackboard.
A.the time B.until C.the minute D.before
问题解答：
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