问题
选择题
We should have teamspirit but there are a few occasions_____members are uncertain of their roles.
A．when
B．whose
C．why
D．which
答案
答案：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。
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