_______ a certain doubt among to the students as to the nece

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_______ a certain doubt among to the students as to the necessity of the work
A.there existed B.there had c.they had D.it existed
麻烦问下为什么D不行

(There existed) a certain doubt among the students as to the necessity of the work.
There existed a certain doubt
和
There was a certain doubt
有相同意思.
It existed a certain doubt 语法不对.
There existed 是固定搭配.
另外句子多了一个单词：among 后面不可有 to .
再问：那我问下 they have / has 是不是只有完成时才可以用
再答：不是， they have/ he has/she has 可以单独用，也可以接完成时态动词，比如 They have breakfast at 6 a.m. every morning They have already finished breakfast.
再问：那这地方为什么不能用呢
再答：问题不是什么地方不能用，这样问等于本末倒置。 they have 的意思是 1. 他们有，他们做 2. 他们做了，他们做好了，。。。后面加什么要看你要表达什么。上面我提供了两个例句： 1.They have breakfast at 6 a.m. every morning 他们每天早上6点吃早餐 2. They have already finished breakfast. 他们吃完了早餐如果你想表达的是第一句的含义，那你就不能用完成时。

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