单选题 2分

There are different types of affixes or morphemes.The affix"-ed"in the word"learned"is known as a(n)...

There are different types of affixes or morphemes.The affix"-ed"in the word"learned"is known as a(n)__________.
  • A.derivational morpheme
  • B.free morpheme
  • C.inflectional morpheme
  • D.free form