Traffic signs are used______the flow of traffic.A、the controlB、controlC、to con

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问题 Traffic signs are used______the flow of traffic.

选项 A、the control
B、control
C、to control
D、for control

答案 C

解析 The verb are used is followed by an infinitive: to control.

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Trafficsignsareused______theflowoftraffic.A、thecontrolB、controlC、tocon