单项选择题

Which of the following ways of word-formation doesn't change the grammatical class of the stems

A．compound
B．inflection
C．derivation
D．coinage
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Distinctive sound refers to______.
A．allomorph
B．phoneme
C．phone
D．minimal pairs
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The Franklin Roosevelt came into power in the period of______.
A．Depression
B．WW Ⅰ
C．WW Ⅱ
D．Civil War
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