Free morphemes are （）of other morphemes. They have complete mean

Free morphemes are （）of other morphemes. They have complete meanings in themselves and can be used as free grammatical units in sentences.
A、dependent
B、independent
C、formal
D、informal
【正确答案】：B
【题目解析】：自由语素是独立于其他语素的。它们本身具有完全的意义，可以作为句子中的自由语法单位使用。