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lookmine
是没有people或者students呀, 没有也可以这样理解呀.是根据句意推断出来的.因为句中有course 一词, 说明谈论的是"学生". 又如: 此句中的先行词those后也没有students一词, 但根据句意可以推断出来: those 就是指的those students. The teacher asked those who had completed their tests to leave the room as quietly as possible.