英语only after the earthquake happened why a smelly gas came o

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英语only after the earthquake happened why a smelly gas came out of
only after the earthquake happened _______ why a smelly gas came out of the cracks in the well walls.
A.did people know B.have people known
B为什么不行?

only+时间状语引起的倒装句用部分倒装,你的问题要看句子的时态,句子不倒装的话是：people_____(know){why a smelly gas came out of the cracks in the well walls }only after the earthquake happened.通过after这个词我可以知道,动作（people）know发生在动作（earthquake）happen之后,原句中happen动作发生在过去,在时间轴上,{过去}之后还不到{现在}仍属于过去,因此know的时态必定属于过去范畴,肯定不能用现在完成时.
告诉你个诀窍哦,有些复杂的句子,动作多了时态确实不好判断,这个时候你可以画一条时间轴,标上{过去}、{现在}、{将来},通过已知的时态和一些连接词像before,since,for,after什么的就容易判断时态了,

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