Moviegoers know that many special effects are created by computers, they often don' tknow is that these scenes still require a lot of work.
A、ThatC
【考情點撥】考查主語從句引導詞。
【應試指導】句意：常看電影的人知道很多特效都是通過電腦制作出來的。但他們往往不知道的是制作這些場景還需要投入大量的工作。分析句子結構可知，空格所在從句在整個句子中充當主語，從句中缺少賓語，且賓語指的是事而非人，故選C。
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