（）are mainly proverbs and sayings.

（）are mainly proverbs and sayings.
A、Idioms nominal in nature
B、Idioms verbal in nature
C、Idioms adverbial in nature
D、Sentence idioms
【正确答案】：D
【题目解析】：Sentence idioms are mainly proverbs and sayings. 句式习语主要是谚语和格言。答案为D。