单项选择题

Morphemes such as -er, -en, in-are all called ________.( )

A．free morphemes
B．inflectional morphemes
C．affixes
D．roots
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单项选择题
Often referred to as a design feature of language, ________ enables speakers to produce and understand an infinite number of sentences that they have neither spoken nor heard before.( )
A．duality
B．productivity
C．displacement
D．arbitrariness
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