不能省略,先行词which指代own task,做的是主语,此句是定语从句,在定语从句中,关系代词作主语的不可省略! All members of the team should try to complete their own task which/that are decided by the manager. 如果在宾语从句中的which做宾语,就可以省略了。例如: I love the flower (that/which) you gave me yesterday! give me the flower