单选题
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
【正确答案】
C
【答案解析】
解析：（-ed在learned中改变了learn的时态，故为曲折变化。)
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