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题目
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)

提问时间:2020-08-03

答案
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.
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