问题
选择题
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
答案：B
题目分析：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.