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Drivers must stop when the traffic lights _____ red．

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

A

解析試題分析：當(dāng)紅綠燈變綠的時候司機(jī)必須停下來。When引導(dǎo)的時間狀語從句的時候，用一般現(xiàn)在時代替一般將來時，所以選A。
考點(diǎn)：考查時態(tài)

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