托福语法题,求详解,The telegraph,invented in the mid-nineteenth centu

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托福语法题,求详解,
The telegraph,invented in the mid-nineteenth century,remained even into the 1970's-------of telecommunication.
(A) a principal system
(B) a system was principal
(C) that was a principal system
(D) a principal system when

选C,俩逗号中间可看作插入语忽略
The telegraph remained even into the 1970's
主谓宾结构完整
那后面就是宾补或从句,选项C符合
(A) a principal system（冠词不接在名词后）
(B) a system was principal（不可以接介词of）
(D) a principal system when（关系代词不可以接介词）

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