therw was a time when后的从句是否要跟完成时例 I can well remember that there was a time when a deep blue sky,the song of birds,moonlight and flowers could never have kept me spellbound.这里为什么要用到完成时?

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• 求高人帮我分析分析现在完成时和过去完成时还有过去时的区别?完全懵了!.两个句子都出自高一英语必修一的一篇文章：Anne's best friend1、She and her family hid away for nearly 25 months before they were discovered.这个句子中的hid away是一个普通的过去时,但是后面却接了一个for+时间段,那么这句子不是应该用现在完成时吗?即：She and her family have hidden away for nearly 25 months before they were discovered.这样不才是正确的吗?2、I can well remember that there was a time when a deep blue sky,the song of the birds,moonlight and flowers could never have kept me spellbound.这个句
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• I can well remember that there was a time when a deep blue sky.为什么SKY前要加“A“啊?原句是I can well remember that there was a time when a deep blue sky,the song of the birds.moonlight and flowers could never have kept me spellbound.为什么SKY前要加“A“啊?SKY难道成可数名词了?
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