--- you having supper at this time yesterday?
---No, I was .
A. Are; having a rest
B. Were; read a book
C. Are; watching TV
D. Were; singing
网友回答
A. Are; having a rest
B. Were; read a book
C. Are; watching TV
(答案→)D. Were; singing
解析：have a rest休息；read a book读书；watch TV看电视；sing唱歌。句意：昨晚这个时候你正在吃晚饭吗？结合语境可知下文描述的是过去正在进行的动作，故选D。