My mother was cooking___.What were you doing ___?A.at that time B.when the telephone rang应如何选?为什么?

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My mother was cooking___.What were you doing ___?A.at that time B.when the telephone rang应如何选?为什么?
My mother was cooking___.What were you doing ___?A.at that time B.when the telephone rang
应如何选?为什么?

My mother was cooking___.What were you doing ___?A.at that time B.when the telephone rang应如何选?为什么?
第一个空选B,第二个选A
翻译:当电话响起的时候我妈妈正在煮饭.你那时正在做什么?
at that time: 是指在过去某段特定的时间,是特指, 是“在那时”的意思,它在本题中特指when the telephone rang的那段时间.

四句都完全正确:
1. My mother was cooking when the telephone rang.
2. My mother was cooking at that time.
3. What were you doing when the telephone rang?
4. What were you doing at that time?

my mother was cooking when the telephone rang.
what were you doing at that time?

My mother was cooking when the telephone rang.
What were you doing when the telephone rang?
What were you doing at that time?