Question

We should have teamspirit but there are a few occasions_____members are uncertain of their roles.

A．when

B．whose

C．why

D．which

Answer 1

A

先行词occasion意思为 “场合；时刻”，表示时间，且从句中不缺主语和宾语，故此处用when引导定语从句，when在从句中作状语。