It _____ that John was ______ than any other student in his class.

It _____ that John was ______ than any other student in his class.
A. believe; less bright B. was believed; less bright
C. believed; more bright D. was believed; more brighter
选项是B。
【It】是形式主语。It做主语肯定【不懂相信】你说是吗？【that】引导的是【主语从句】。句中有【引导比较的than】，我们要选【比较级】。

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句子的意思是：“据信.......”是被相信（it为形式主语，John was ______ than any other student in his class.是实际主语），故选B或D;
D中brighter已经是比较级了，more brighter为错，

因此，选B。

B. was believed; less bright

it was believed that ...这是固定句型, "有人相信/据信...."

less+原级+than... ,意为".... 不如....的"

句意: 有人认为. 约翰不如他班上的任何其他学生聪明.