Once in a theater wearing 3D glasses, you feel as though you are caught up in the story w

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(答案→)A. seated
B. be seated
C. to sit
D. have been sitting
解析：考查分词转换的形容词用法。动词seat使…就坐；能容纳；它的过去分词转换的形容词seated表示就坐的状态。可以修饰名词，对主语的情况进行说明。句意：一旦坐在剧院里，带上3D眼睛，你就会感觉到你身临一个发生在你身边的故事。故A正确。