请分析句子的时态People had been drinking white the willow bark for thousands of years, but no one knew why it helped.
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请分析句子的时态People had been drinking white the willow bark for thousands of years, but no one knew why it helped.
请分析句子的时态
People had been drinking white the willow bark for thousands of years, but no one knew why it helped.
请分析句子的时态People had been drinking white the willow bark for thousands of years, but no one knew why it helped.
have been doing 现在完成进行时,表示动作从过去开始,一直持续到现在,动作可能已经完成,可能还要持续下去.
前半句是过去完成进行时,后半句是一般过去时。
望采纳,谢谢~
前面半句用过去完成进行体表示过去一直在做,后半句用一般过去时表示“知道”的一般状态
请分析句子的时态People had been drinking white the willow bark for thousands of years, but no one knew why it helped.
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