被动语态可以不带be动词么？？？

Question

请详解一下这道题·········
这道题选C
Experts think that we need to eat meat because it contains vitamins and minerals _____ in vegetables.
A. not finding B. not to find C. not found D.which is not found
答案解析是；vitamins and minerals 与 find 之间是被动关系，所以应使用过去分词；B项表示将来的动作；D项英使用which are not found

C项里面没有be动词呀？不是说被动语态都要有被动词么？？

Answer 1

因为从句是省略表达的
所以be动词就省略了
D选项中的is若改为are，也会是正确答案。

Answer 2

被动语态与被动关系不是同一概念

Answer 3

这是个定语从句，省略了主语和谓语，完整的应该是vitamins and minerals which are not found in vegetables.

Answer 4

被动语态在有些场合是可以不带be的，就是常说的动词过去分词表被动…
中间省略了which are

Answer 5

found 就是被动啊 这里省略了which are 定语从句吧！
我任务的 最好取为答案 嘿嘿~~ 谢啦