Unlike affixes,（ ）are often free morphemes.
A、suffixes
B、prefixes
C、inflectional morphemes
D、roots
【正确答案】：D
【题目解析】：These morphemes have complete meanings in themselves and can be used as free grammatical units in sentences. They are identical with root words, as each of them consists of a single free root. Therefore, we might as well say that free morphemes are free roots. 这些语素本身具有完备的意义，在句子中可以用作自由语法单位。它们与词根相同，因为每个词根都由一个自由词根组成。因此，我们不妨说自由语素是自由词根。
