I_____(understand) the question when the class was over.

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I_____(understand) the question when the class was over.
I_____(understand) the question when the class was over.

I_____(understand) the question when the class was over.
这里不用过去完成时是因为 主句从句动作是同时发生的而没有先后关系

understood
祝你学习进步,更上一层楼! (*^__^*)
不明白的再问哟,请及时采纳,多谢!