2 sentences

1. 他否认曾参与这起抢劫案。

   tā fǒu​rèn céng cān​yù zhè qǐ qiǎng​jié'àn.

   He denied having participated in the robbery.

   Source: CCMatrix

2. 他曾参加过远程自行车赛和好几个马拉松赛。

   tā céng cān​jiā guo yuǎn​chéng zì​xíng​chē​sài hé hǎo​jǐ​gè mǎ​lā​sōng sài.

   He has taken part in long-distance cycle races and run several marathons.

   Source: UM-Corpus: Education