问题补充：
It’s a fact he has not received the letter.
A. that
B. which
C. whether
D. what
答案：
(答案→)A. that
B. which
C. whether
D. what
解析：考查定语从句。本句中从句内容修饰前文整句话内容，故引导词用that，选A。
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