问题补充：
The teacher asked us .
A. when did I finish my work
B. why didn’t we tell him about it earlier
C. what we were interested in
D. where we are going to have our lunch
答案：
A. when did I finish my work
B. why didn’t we tell him about it earlier
(答案→)C. what we were interested in
D. where we are going to have our lunch
解析：本题考查宾语从句。宾语从句应用陈述语序。故首先排除A、B，又因为主句为过去式，应排除D项，故选C。
