_____ are bound morphemes because they cannot be used as separat

_____ are bound morphemes because they cannot be used as separate words. [ ]
A、Roots
B、Stems
C、Affixes
D、Compounds
【正确答案】：C
【题目解析】：参考教材P40，词缀是被束缚的语素，因为它们不能作为单独的词来使用。