单项选择题

A．should remain effective
B．should be abolished
C．should be discussed again
D．should be supplemented
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单项选择题
A．One.B．Two.C．Three.D．Fiv
A．One.
B．Two.
C．Three.
D．Fiv
单项选择题
______ is a system of arbitrary vocal symbols used for human communication.
A．Linguistics
B．Syntax
C．Morphology
D．language
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