求问The question set off a lively discussion为什么不是sets?

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求问The question set off a lively discussion为什么不是sets?
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求问The question set off a lively discussion为什么不是sets?
求问The question set off a lively discussion
为什么不是sets?

求问The question set off a lively discussion为什么不是sets?
The question set off a lively discussion.此处是过去时.
set 过去时 set