Much of our grammatical knowledge is represented through Phrase

Much of our grammatical knowledge is represented through Phrase Structure Rules, which state explicitly all and only the possible combinations of the ______ of a language, for example, in English, NP→(Det) (Adj) N (PP) (S).
A、phrases
B、clauses
C、sentences
D、constituents
【正确答案】：D
【题目解析】：Much of our grammatical knowledge is represented through Phrase Structure Rules, which state explicitly all and only the possible combinations of the constituents of a language, for example, in English, NP→(Det) (Adj) N (PP) (S).