The forms that are attached to words or word elements to modify

The forms that are attached to words or word elements to modify meaning or function are________ .
A、allomorphs
B、affixes
C、roots
D、stems
【正确答案】：B
【题目解析】：题干中提到可以加在词或者构词成分上，改变意义或者词性，这两个特点就是B选项词缀的特点。答案依据在课本第46页和48页前缀和后缀的特点。