Participated
v. 參加, 參與( participate的過去式和過去分詞 )
??? 情景例句
No one knows for certain what happened, but it's a fair bet that it was not an accident.
沒有人知道究竟發生了什么，但幾乎可以肯定這并非意外。
I start work at 8 o'clock.
我八點開始工作。
You'd better take a hat.
你最好戴上帽子。