Question

— Where are your brothers?
— ________

1. A.
   He is at school
2. B.
   He is in his room
3. C.
   Yes，they are
4. D.
   I don’t know

Answer 1

D
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。