Chiefly found in derived words, bound morphemes include（）.

Chiefly found in derived words, bound morphemes include（）.
A、bound roots
B、inflectional affixes
C、derivational affixes
D、all the above
【正确答案】：D
【题目解析】：Bound morphemes include two types: bound root and affix. Affix can be put into two groups： inflectional and derivational affixes. 粘附词素有两类：粘附词根和词缀。词缀又可分为两组：内部屈折词缀和派生词缀。答案为D。