[单选题]Moviegoers know that many special effects are created by computers.（）they often don't know is that these scenes still require a lot of work.

That

Whom

What

How

正确答案：C

题目解析

本题考查主语从句的使用。
分析句子结构，空缺处所在从句在整个句子中充当主语，而从句中缺少宾语，且宾语指的是事而非人，that在从句中不充当成分，排除A；whom表示人，排除B；what可表示事物，how表示程度、方式，排除D，故选C。
句意：常看电影的人知道许多特效都是通过电脑制作出来的。但他们往往不知道的是制作这些场景还需要投入大量的工作。

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[单选题]Moviegoers know that many special effects are created by computers.（ ）they often don't know is that these scenes still require a lot of work.

[单选题]Moviegoers know that many special effects are created by computers.（）they often don't know is that these scenes still require a lot of work.