— Could you tell me last night? — Er I was watching TV at home. A. what you were doingB.

问题补充：

— Could you tell me last night?

— Er, I was watching TV at home.

A. what you were doing

B. what were you doing

C. what you are doing

D. what are you doing

答案：

(答案→)A. what you were doing

B. what were you doing

C. what you are doing

D. what are you doing

解析：句意：你能告诉我昨晚你在做什么吗？呃，我在家里看电视。根据last night可知该用过去时态。在宾语从句中只能用陈述句语序，不能用疑问句语序，所以选A。