Many students( )(talk)when the teacher( )(come)into the classroom yesterday.( )(come)into the classroom yesterday.原因理由全一点

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Many students( )(talk)when the teacher( )(come)into the classroom yesterday.( )(come)into the classroom yesterday.原因理由全一点
Many students( )(talk)when the teacher( )(come)into the classroom yesterday.
( )(come)into the classroom yesterday.原因理由全一点

Many students( )(talk)when the teacher( )(come)into the classroom yesterday.( )(come)into the classroom yesterday.原因理由全一点
were talking came
were talking 这个相对稳定的,持续时间较长的动作常用过去进行时,为短暂动作came 作时间铺垫