问题补充:
---Remember the first time we met, Mary?
---Sure.You in the supermarket.
A. had shopped
B. have shopped
C. were shopping
D. shopped
答案:
A. had shopped
B. have shopped
(答案→)C. were shopping
D. shopped
解析:考查时态。句意:——还记得我们第一次见面的情景吗?——记得,那时候你正在图书馆读书!强调的是当时正在干什么,所以选C 过去进行时态。