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.
My mother was cooking___.What were you doing ___?A.at that t
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