There was a loud knock at the door.(用时间状语从句合并成一个句子)She was answering the telephone.There was a loud knock at the door.(用时间状语从句合并成一个句子)

问题描述:

There was a loud knock at the door.(用时间状语从句合并成一个句子)
She was answering the telephone.There was a loud knock at the door.(用时间状语从句合并成一个句子)

She was answering the telephone while there was a loud knock at the door.
她正在接电话,这时,有个很大的敲门声。

There was a loud knock at the door when she was answering the telephone.
加一个引导时间状语的词或词组即可.