____ of them think that is a good idea.

c
用none of sth做句子的主语的时候，句子的谓语部分不一定都是用单数第三人称的。 如果用someone/anyone 是表示某个人/任何一个人， 谓语部分真的要用单数第三人称了。 B选项的情况下，一般后面不加of sb/sth, 而是直接用了。句子可以是：
No one can tell me the correct answer或者
None of them can tell me the correct answer.而非：No one of them can tell me the correct answer.

None of them think that is a good idea.
A. Anyone
B. No one
C. None
D. Someone
从句子结构 ，只有C项才对。

A. Anyone thinks that is a good idea.
B. No one thinks that is a good idea.
C. None of them thinks that is a good idea.
D. Someonethinks that is a good idea.

D. Someone
someone of them think that is a good idea.

你看think用的是原型，那明显就是D了

C 其他几个都不可以后面跟“of ”的啊