Which conjunction is most appropriate to complete the sentence: 'The fact ______ he passed the exam surprised everyone'?

A. which

B. where

C. that

D. when

核心考点：同位语从句引导词。解题思路：同位语从句需用that引导特定抽象名词后的完整陈述。正确选项C使用that引导'fact'的同位语。错误选项分析：A(which引导定语从句需作成分)、B/D(where/when需表地点/时间逻辑)。易错点：混淆同位语从句与定语从句的区别。

正确答案：C

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