选哪个,请给出原因.A.which B.that C.when D.how

题目

选哪个,请给出原因.A.which B.that C.when D.how
In a sports team each player has a clear role,and there are few occasions______menbers are confused or uncertain of their roles

答案

C,when
你记住就行,当先行词是occasion时,关系词就用when,任何情况适用的