Duringthepast120years,theworld

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During the past 120 years, the world three waves of global economic integration（联合）.

A．witnessed	B．witnesses
C．has witnessed	D．will witness

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A．seemed	B．appeared
C．happened	D．thought

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A．of	B．in
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A．flows	B．columns
C．floods	D．currents

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A．effective	B．efficient
C．flexible	D．sufficient

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A．when; took	B．before; took
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