--Where is your brother? ---I think he is still inbed but he might just be inbathroom.A.

问题补充：

--Where is your brother?

---I think he is still inbed,but he might just be inbathroom.

A. /, /

B. the,the

C. the, /

D. /,the

答案：

A. /, /

B. the,the

C. the, /

(答案→)D. /,the

解析：考察冠词.句意:你的哥哥在哪儿?_我认为他仍在睡觉,但是他只可能是在浴室里面.bed前不加冠词表示卧床休息,结合语境可知下文是特指某个地方,故用定冠词,故选D.