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Drivers must stop when the traffic lights _____ red.

A.turnB.will turn
C.turnedD.were turning

A

解析试题分析:当红绿灯变绿的时候司机必须停下来。When引导的时间状语从句的时候,用一般现在时代替一般将来时,所以选A。
考点:考查时态

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