题目内容：

---did he have clean the blackboard?sorry i don't know
AwayBwhatCwhereDwhen
为什么cd不对?老师说史因为have后面加了原型,那这个have怎么解释

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---did he have clean the blackboard?sorry i don't know AwayBwhatCwhereDwhen为什么cd不对?老师说史因为have后面加了原型,那这个have怎么解释?答：我估计原题是： --____ did he have clean the blackb...