______ John could not pass the final exam was once believed by all his roommates

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问题 ______ John could not pass the final exam was once believed by all his roommates.

选项 A、For
B、It was
C、That
D、While

答案 C

解析空格后有两个非并列的谓语，空格处一定是需要从句引导词构成主从复合句，B可先排除，因final exam是pass的宾语，不是was的主语，可见是从句作句子的主语，只有C引导的是主语从句，符合要求；A和D都构成状语从句，但主句缺主语，故不正确。

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