It is assumed that Laozi must have lived ()two historical periods in Chinese history known as Spring

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It is assumed that Laozi must have lived ()two historical periods in Chinese history known as Spring and Autumn Period and the Warring States Period. (time: 2:44)

A.at the junction of

B.in the connection

C.on the adjunction of

D.conjunction

参考答案:

答案:at the junction of