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

发布时间：2020-08-16 09:20:22

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

网友回答

A. formed
(答案→)B. came into being
C. was e into being
D. was forming
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