问题补充：
-How long have you been in the room?
- Just a few minutes. My cousins home together with me.
A. have walked
B. had walked
C. walked
D. have been walking
答案：
A. have walked
B. had walked
(答案→)C. walked
D. have been walking
解析：考查时态的用法。根据答语just a few minutes可知说话人此刻正是在房间里，因此“走回家”这一动作发生在现在之前，应使用一般过去时态。
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