Before revision:  In the third subtask, a participating system needs to generate the reason automatically .
After revision:  In the third subtask, a participating system needs to generate the reason . We finally attracted 39 teams participating at least one of the three subtasks. For Subtask A and Subtask B, the performances of top-ranked systems are close to that of humans. However, for Subtask C, there is still a relatively large gap between systems and human performance. The dataset used in our task can be found at URL Task4-Commonsense-Validation-and-Explanation; The leaderboard can be found at URL/competitions/21080#results .