Phrase structure rules allow us to better understand（ ）___.
A.how words and phrases form sentences B.what constitutes the grammaticality of strings of words C.how people produce and recognize possible sentences D.All of the above正确答案D
Phrase structure rules allow us to better understand（ ）___.
A.how words and phrases form sentences B.what constitutes the grammaticality of strings of words C.how people produce and recognize possible sentences D.All of the above正确答案D
