问题补充：
My brother while I .
A. reads; was doing my homework
B. read; did my homework
C. was reading; was doing my homework
D. was reading; did my homework
答案：
A. reads; was doing my homework
B. read; did my homework
(答案→)C. was reading; was doing my homework
D. was reading; did my homework
解析：本题考查时态。句中while表示对比，“然而”之意。句意：我的哥哥正在阅读，而我正在做我的家庭作业。
