______ 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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