her uncle made a film

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这个空需要填film的后置定语,这里可以填basing on.其实填which is based on也对.但which based 是不行的.因为,这里film是以his story in his childhood为背景的,是被动关系.
======以下答案可供参考======
供参考答案1:
动名词做定语，这里是分词不是从句不需要which做连接词