问题
选择题
The reason ____ he was late for school was _____he had to send his mother to a hospital.
A．that; why
B．why; because
C．why; that
D．that; because
答案
C
题目分析：句意：他为什么会上学迟到的原因是他不得不送妈妈去医院。第一空填why。引导定语从句，先行词是reason，定语从句中缺少原因状语，第二空填that，连接表语从句，当主语是the reason的时候，表语从句用that连接，所以选C。