A：in which
B：in what
C：from what
D：from which
根据一组样本数据x1,y1,x2,y2,···,xn,yn的散点图分析存在线性相关关系，求得其回归方程y∧=0.85x-85.7，则在样本点165,57处的残差为（ ）
— I'm not going swimming this afternoon.— ______. I have to help my mother do some cleaning.
