_______ the letter ,I ran out of the room to the post office.

题目

_______ the letter ,I ran out of the room to the post office.
这个怎么填啊,为什么
soon as I finished writing，

答案

as soon as是连词,表示“一...就...”,表示finished这个动作之后,紧接着发生了ran这个动作,既然后者是一般过去时,那么前者也就是一般过去时了.