I have also witnessed a player reacting to his opponent蒺s intentional and illegal blocking by deliberately hitting him with the ball as hard as he could during the course of play. (05.6 Passage 1)如何查四级成绩

分析主干：I have (also) witnessed a player reacting

reacting 在句中是现在分词，作宾语a player 的补语;by... hitting...是reacting 的方式状语，hitting 作介词by 的宾语。as hard as he could 是比较结构，表示“尽力”。

译文：还有一次我看到过一个球员在比赛中因为对方的一个有意犯规阻挡，而故意使足了力气把球砸向对方。