我的问题是下面这道题为什么不能选C？我觉得ACD没什么差别啊？
Each member of the journalistic pair served as ______ the other: each refrained
from publishing a given piece if the other doubted that it was ready to be printed.
(A) a check on
(B) an advocate for
(C) an impediment to
(D) a brake on
(E) an apologist for
(F) an intermediary for
出处：PPII, Practice Test 2, V2, Medium, #15
多谢解答！
2个回答
The word "impediment" is often used in the context of juridical activity. If a person behaves with impediment, it usually implies that the person has a bad intention, while "refrain" is kind of neutral in the intention. That's probably why the word "impediment" is crossed out. I think that the emotional elements should be considered in this blank.
impediment :something that makes it difficult to do or complete something : something that interferes with movement or progress
check:to slow or stop (something or someone) from doing something
brake: something used to slow or stop movement or activity — usually + on
refrain:to stop yourself from doing something that you want to do
查的英文字典
