I don’t know.Because he has to look after his mother.A. why he is leavingB. why is he leav

问题补充：

I don’t know.

Because he has to look after his mother.

A. why he is leaving

B. why is he leaving

C. whether he is leaving

D. whether is he leaving

答案：

(答案→)A. why he is leaving

B. why is he leaving

C. whether he is leaving

D. whether is he leaving

解析：英语宾语从句中一般用陈述语序。根据下文，因为他必须照顾她的母亲。可知上文提问的是原因，选项B为倒装语序，故选A，我不知道他为什么离开了。