The reason he gave at the meeting was not the exact reason he failed to show up on time.

问题补充：

The reason he gave at the meeting was not the exact reason he failed to show up on time.

A. why; that

B. which; that

C. that; why

D. that; which

答案：

A. why; that

B. which; that

(答案→)C. that; why

D. that; which

解析：考查定语从句，第一空是定语从句，先行词是the reason，定语从句缺少宾语，用that或是which引导定语从句，第二空填why引导定语从句，先行词是the reason，定语从句缺少原因状语，句意：他在开会的时候给出的原因不是他没能准时出现的真正原因，选C。