---Remember the first time we met Mary? ---Sure．You in the supermarket．A. had shoppedB.

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。