问题补充：
----does your brother do his homework?
----At 8:00 in the morning.
A. What color
B. How old
C. What time
D. How long
答案：
A. What color
B. How old
(答案→)C. What time
D. How long
解析：A.What color什么颜色 B.How old多大的年龄 C.What time什么时候 D.How long多长时间；句意：你的哥哥什么时候做作业？早上8点。故选C
