英语达人速度------------Do you knoe Jane?------------Yes,I first met her three years ago,she() at a school at thar timeA worked B was working C has worked为什么用B?不能用A吗?

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英语达人速度------------Do you knoe Jane?------------Yes,I first met her three years ago,she() at a school at thar timeA worked B was working C has worked为什么用B?不能用A吗?

英语达人速度------------Do you knoe Jane?------------Yes,I first met her three years ago,she() at a school at thar timeA worked B was working C has worked为什么用B?不能用A吗?
英语达人速度
------------Do you knoe Jane?
------------Yes,I first met her three years ago,she() at a school at thar time
A worked B was working C has worked
为什么用B?不能用A吗?

英语达人速度------------Do you knoe Jane?------------Yes,I first met her three years ago,she() at a school at thar timeA worked B was working C has worked为什么用B?不能用A吗?
不能用A,因为后面跟了一个表示过去进行时时态的词组 at that time.这个词组常与过去进行时态连用,同类的还有at that moment.

过去式表示过去的动作,现在已停止。过去进行时表示过去正在发生的动作。从句子最后说at that time 说明表示过去正在发生的动作