In a sport team each player has a clear role，and there are few occasions members are confused or uncertain of their roles.
A. why
B. that
C. when
D. in which
网友回答
A. why
B. that
(答案→)C. when
D. in which
解析：
试题分析:考查定语从句。occasion后面的定语从句意思完整，不缺少成分，所以用关系副词when，相当于on which，故答案选C。句意：在一个体育队中，每个运动员都有明确的角色分工，很少有队员困惑或者不确定自己角色的时候。