______ morphemes are those that cannot be used independently but have to be combined with other morphemes, either free or bound, to form a word. ()
A、Free
B、Bound
C、Root
D、Affix
【正确答案】：B
【题目解析】：(P51):黏着词素是那些不能够独立使用,必须和其他的自由词素或黏着词素组合才能形成一个单词的词素。黏着词素包括两类:词根和词缀。