不锈钢管子是否作消除应力处理应根据（）确定。
A.现场施工条件
B.设计要求和规范的规定
C.有关资料
D.施工经验
参考答案：B
A: You look very nice in your new dress today.
B: Oh, really? I _________ it when it was on sale. [ ]
A. buy
B. bought
C. have bought
D. will buy
