I don’t know the reason you were absent from the meeting and I am not sure that someone

问题补充：

I don’t know the reason you were absent from the meeting, and I am not sure that someone will tell me the reason you haven’t told me.

A. why; that

B. that; why

C. because; why

D. of which; that

答案：

(答案→)A. why; that

B. that; why

C. because; why

D. of which; that

解析：本题考查定语从句。第一空填关系副词why，先行词是the reason，在从句中作状语；第二空填关系代词that，先行词是the reason，但是定语从句中作told的直接宾语。句意：我不知道你缺席会议的原因，而且我不确定有人告诉我你没有告诉我的原因。选A。