问题补充：
--- Did you know ?
--- He was ill in hospital.
A. why he doesn’t come to school
B. why he didn’t come to school
C. why does he come to school
D. why did he come to school
答案：
A. why he doesn’t come to school
(答案→)B. why he didn’t come to school
C. why does he come to school
D. why did he come to school
解析：英语宾语从句中一般为陈述语序。联系下文，他生病住院了。可知上文描述的是过去发生的动作，故用一般过去时态，选B。
