Classification of idioms can be approached from different angles

Classification of idioms can be approached from different angles. The course book prefers the criterion of（ ）function.
A、rhetorical
B、stylistic
C、lexical
D、grammatical
【正确答案】：D
【题目解析】：成语的分类可以从不同的角度进行探讨。本教材更倾向按照构成语法功能的标准来分类。