摘要： No one knows when such a custom first . A. formed B. came into being C. was come into being D. was forming
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No one knows when such a custom first ________.
[ ]
A. formed
B. came into being
C. was come into being
D. was forming
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B. came into being
C. was come into being
D. was forming
.
No one knows when such a custom first __________.
A. formed B. came into being
C. was come into being D. was forming
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No one knows when such a custom first __________.
|
A．formed |
B．came into being |
|
C．was come into being |
D．was forming |
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