inventors created machines that would quickly move pictures_____were visible to the eye as motion.A which B where 填哪个?为什么?

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inventors created machines that would quickly move pictures_____were visible to the eye as motion.A which B where 填哪个?为什么?
inventors created machines that would quickly move pictures_____were visible to the eye as motion.
A which B where 填哪个?为什么?

inventors created machines that would quickly move pictures_____were visible to the eye as motion.A which B where 填哪个?为什么?
当然是which,因为 空白处的关系词在从句中做主语,那就只能选关系代词,不能选关系副词.