— Where are your brothers?— .A. He is at schoolB. He is in his roomC. Yes they are D. I do

问题补充：

— Where are your brothers?

— .

A. He is at school

B. He is in his room

C. Yes，they are

D. I don’t know

答案：

A. He is at school

B. He is in his room

C. Yes，they are

(答案→)D. I don’t know

解析：本题的问句表示地点，主语人称是复数，是特殊疑问句，AB主语为单数不选，C为一般疑问句的回答不选，故本题选D。