Reading is an experience quite different from watching TV; there

Reading is an experience quite different from watching TV; there are pictures ____ in your mind instead of before your eyes.
A、to form
B、form
C、forming
D、having formed
【正确答案】：C
【题目解析】：考查分词做定语用法。Pictures与form构成主动关系，故使用现在分词短语做定语修饰pictures.句意：阅读是一种鱼看电视完全不一样的经历。在你的思维中而表示在你的眼前形成了很多的照片。故D正确。