[題目] 片語問題?

作者: trtr112 (pk)   2019-01-22 21:57:09
請問各位先進,
Exactly when extreme sport started becoming popular is hard to determine,
but it might
作者: eric10252013 (HC)   2019-01-23 07:56:00
A / 這邊要用「被追溯至」的用法喔
作者: kindaidiot03 (大雷)   2019-01-24 10:47:00
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