问题补充：
The reason he didn’t come was he was injured.
A. that; because
B. why; that
C. why; because
D. that; that
答案：
A. that; because
(答案→)B. why; that
C. why; because
D. that; that
解析：第一空考查定语从句，此处the reason是先行词，其在定语从句中作原因状语，用why；第二空考查表语从句，he was injured是一个完整的句子，不缺成分，故用that；所以选B。句意：他为什么没来的原因是他受伤了。
