Drivers must stop when the traffic lights _____ red．
A．turnB．will turn
C．turnedD．were turning
A

試題分析：當(dāng)紅綠燈變綠的時(shí)候司機(jī)必須停下來。When引導(dǎo)的時(shí)間狀語從句的時(shí)候，用一般現(xiàn)在時(shí)代替一般將來時(shí)，所以選A。
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