单项选择题

A．In 1968
B．In 1886
C．In 1868
D．In 1866
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Polish
单项选择题
______ is a design feature of human language that enables speakers to talk about a wide range of things, free from barriers caused by separation in time and space.
A．Displacement
B．Arbitrariness
C．Duality
D．Productivity
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