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A:What did you do last weekend?B:I worked at the university

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A:What did you do last weekend?B:I worked at the university bookstore.A:I didn't know you had a job.B:Yeah,I‘m a cashier there.
为什么是you had a job ,那个工作B现在还在做呀。
I didn't know you had a job. B:Yeah,I‘m a cashier there.
解析:didn't 过去时,主句是过去时,从句也要用过去时.