单项选择题

The words "make" and "bus" are called ______ because they can occur unattached.

A．derivational morphemes
B．inflectional morphemes
C．bound morphemes
D．free morpheme
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单项选择题
In terms of literature, the period before the American Civil War is commonly referred to as ______.
A．the Romantic Period
B．the Realistic Period
C．the Naturalist Period
D．the Modem Period
单项选择题
What kind of function does the sentence How do you do have
A．Directive.
B．Phatic.
C．Informative,
D．Evocative.
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