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托福语法题,求详解,Thetelegraph,inventedinthemid-nineteenthcentury,remainedevenintothe1970's-------oftelecommunication.(A)aprincipalsystem(B)asystemwasprincipal(C)thatwasaprincipalsystem(D)aprincipalsystemwhen

题目详情
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
▼优质解答
答案和解析
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)