1、once说明是曾经发生的,也就是过去发生的,而B选项是过去分词,有被动完成的意思.现在分词有主动进行的意思.
2、第二个用leave的过去分词形式,表被动完成,脚印是被他所留下,
Do you really belive dinosaurs once_______in jurassic time?
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