The allomorphs of a morpheme may differ in meaning and function.
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Every word contains a root morpheme.
A. 对
B. 错
A morphemic shape donates only one meaning.
A. 对
B. 错
The minimal free unit of meaning is morpheme.
A. 对
B. 错
Prefixes occur at the beginning of a word, and usually do not change the word class of the original word.
A. 对
B. 错
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