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：考察连词，第一空为定语从句，先行词reason 在从句中充当原因状语，所以选择why,第二空是表语从句，从句中不缺少成分，所以选择that
句意为，他不能来的原因是他受伤了。
