The reason he didn’t come was that he was injured.A. thatB. whyC. because D. when

问题补充：

The reason he didn’t come was that he was injured.

A. that

B. why

C. because

D. when

答案：

A. that

(答案→)B. why

C. because

D. when

解析：考查定语从句;先行词是the reason，定语从句中缺少原因状语，用why引导定语从句，句意：你知道他没来的原因是受伤了吗？