They came into classroom after they heard the bell.

问题描述:

They came into classroom after they heard the bell.
They come into classroom they heard the bell.这2个空该怎么填?各路高人为我指点迷津啊`````
They`````come into classroom`````they heard the bell.

They come into classroom (the moment)they heard the bell.
the moment 一...就...
They quickly come into classroom (the moment)they heard the bell.