问题补充:
---Where were you this morning?
---I in the supermarket.
A. will shop
B. am shopping
C. was shopping
D. have shopped
答案:
A. will shop
B. am shopping
C. was shopping
D. have shopped
解析:考查动词的时态。根据句意,问句中用了were,应该用过去时来回答。was shopping是过去进行时,符合句意。故选C。