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

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