（2010·浙江余杭高级中学高三上第二次月考） 19. In a sports team each player has a clear role, and there are few occasions ________members are confused or uncertain of their roles.
A. why B. where C. when D .in which
（2010·浙江余杭高级中学高三上第二次月考） 19. In a sports team each player has a clear role, and there are few occasions ________members are confused or uncertain of their roles.
A. why B. where C. when D .in which
C