Everyone stands up when the teacher (come) into the classroom.填什么

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Everyone stands up when the teacher (come) into the classroom.填什么
Everyone stands up when the teacher (come) into the classroom.填什么

Everyone stands up when the teacher (come) into the classroom.填什么
comes
根据时间状语从句时态一致的原则,主句用了stands up,一般现在时,根据句意“老师进入教室的时候同学们起立”,可判断出主从句的动作是同时发生的,从句可用一般现在时或现在进行时;但come是延续性动词,所以不用现在进行时,只能选择comes一般现在时.