Since early 1980s Noam Chomsky and other generative linguists proposed and developed a theory of universal grammar known as the ______ theory.
A、speech act
B、TG
C、principles-and-parameters
D、X-bar
【正确答案】：C
【题目解析】：Since early 1980s Noam Chomsky and other generative linguists proposed and developed a theory of universal grammar known as the principles-and-parameters theory.