问题补充：
We didn’t know how to find them because they didn’t tell us .
A. which room did they live
B. which room they lived in
C. which room they lived
D. which room did they live in
答案：
A. which room did they live
B. which room they lived in
C. which room they lived
(答案→)D. which room did they live in
解析：句意：因为他们没有告诉我们他们住哪个房间，所以我们不知道如何找到他们。特殊疑问句做宾语从句时的词序为：疑问词+主语+谓语+宾语。故选D。
