Some linguists thought that all languages ______ and were ruled by a common grammar.
A、originated from one language
B、started as the same language
C、came from many different languages
D、borrowed words from one another
【正确答案】：A
【题目解析】：一些语言学家认为所有的语言都起源于一种语言，并由一种共同的语法所支配。