题目内容
The following morphemes are all bound roots except for ____________.
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The word ‘childish’ contains two ---------.
______ modify the meaning of the base , but usually do not change the part of speech of the original word.
The word ‘labiodental’ contains two _____.
------------ change the part of speech of the root, but usually do not change the lexical meaning of the original word.
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