单项选择题

（）makes it possible for language users to overcome the limitations of time and space in communication.

A.Arbitrariness
B.Duality
C.Productivity
D.Displacement

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单项选择题
In fact，they would rather have left for London （）in Birmingham.

A.to stay
B.in order to stay
C.than have stayed
D.instead of having stayed
单项选择题
He had no time and energy to play with his children or shop with his wife，bu!he（）home a regular salary.

A.did bring
B.does bring
C.did get
D.does get
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