The reason he was absent from class was his mother fell ill this morning.A. for; thatB. w

问题补充：

The reason he was absent from class was his mother fell ill this morning.

A. for; that

B. why; that

C. for; because

D. why; because

答案：

A. for; that

(答案→)B. why; that

C. for; because

D. why; because

解析：考查定语从句和表语从句：句意：他昨天旷课的原因是他妈妈早上病了。先行词是The reason，定语从句缺少原因状语，用why引导定语从句，第二空是表语从句，主语是the reason的时候，表语从句用that引导，选B.