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问题: 一道高一英语题

The film was made____on a true old story.
A.base
B.to be based
C.based
D.basing
答案选C能解释一下为什么吗?base在这里做什么成分不是made的伴随状语吗?它和made的关系不是主动吗?
谢谢啦~~

解答:

The film was made____on a true old story.
A.base
B.to be based
C.based
D.basing

主语 the film 谓语 was made(被动语态) 动作执行者省略。 based on a true old story 补语。补充说明。 based .... 是过去分词短语做补语。