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10.Drivers must stop when the traffic lights _____ red.(  )
A.turnB.will turnC.turnedD.were turning

分析 当交通信号灯红灯亮时,司机必须要停车.

解答 答案:A.
本句为when引导的时间状语从句.在时间、条件、让步状语从句中通常要用一般现在时表示将来的动作,所以排除B项,C为一般过去时,表达的是过去的动作;D项为过去进行时表示过去某一时刻正在进行的动作;故选A.

点评 对于时态的运用要注意不同时态的运用环境,结合时间状语及具体语境和时态的用法来作出判断.

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