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No one knows exactly when humans began eating honey.

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No one knows exactly when humans began eating honey.
一道 高一完形填空题 关于蜂蜜的历史以及养蜂对美国农民的影响的.觉得原文句子有毛病(水平低.
No one knows exactly when humans began eating honey.
没有问题啊
没有人知道人类什么时候开始食用蜜糖……
No one 是主语
knows exactly 是谓语
when humans began eating honey.是宾语从句