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. No one knows when such a custom first . A.formed B.came into being C.was come

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. No one knows when such a custom first . A.formed B.came into being C.was come

.

No one knows when such a custom first__________.

A.formed

B.came into being

C.was come into being

D.was forming

 

试题答案

【答案】

B

【解析】略