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Perhaps the most significant postwar trend was the decentralization of cities throughout the UnitedStates，( )when massive highway-building programs permitted greater suburban growth.

单选题
Perhaps the most significant postwar trend was the decentralization of cities throughout the UnitedStates，( )when massive highway-building programs permitted greater suburban growth.

Aand accelerated a phenomenon

Ba phenomenon that accelerated

Caccelerating a phenomenon which

Dthe acceleration of which phenomenon

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