题目内容
A ____is any morpheme or combination of morphemes to which an inflectional affix can be added.
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“Radar” is a/an _____.
The words that which refer to substance, action and quality are called____________.
“ s ” in “ boys”, “ boy’s” and “it rains” is called ___________affix.
The morphemes that cannot be used by themselves, but must be combined with other morphemes to form words are called__________ morphemes.
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