invented是invent的被动语态吗（为什么第68题是invented而不是were）

楼主提问，为什么第68题是invented而不是were invented？

为了让大家看得更清楚，提取出整个句子：

It was the first highly trusted, low-cost, mass-produced medical respirator in the world，____ （intent）by Forrest Bird.

首先，这句话没有词组短语，属于纯单词句，我们逐词理解就可以了。用学霸廖唯伟发明的乱词排序法，思维的过程：

看懂意思就好办了，句子主谓宾是：它是呼吸机，逗号连接的部分没有连词，所以是非谓语结构，“发明”和“呼吸机”的关系是“发明呼吸机”，动宾关系，根据非谓语秒杀法口诀“动宾用ed”，所以是invented。

如果想要改成was invented使之成立，句子有两种改法：

① 定语从句： It was the first highly trusted, low-cost, mass-produced medical respirator in the world, which was invented by Forrest Bird.

which 指代 呼吸机

② and连接的并列句： It was the first highly trusted, low-cost, mass-produced medical respirator in the world, and was invented by Forrest Bird.

and 连接句子 It was invented by Forest Bird. 主语相同，省略主语。