问题补充：
The why he is absent today is he has got a bad headache.
A. reason; that
B. reason; because
C. cause; that
D. cause; because
答案：
(答案→)A. reason; that
B. reason; because
C. cause; that
D. cause; because
解析：考查名词性从句。本题考查the reason why … is that…，……的原因是…….前为主语从句，后为表语从句，选A。
