Stop walking and look arouond when ___ the road.A crossB acrossC crossedD crossing答案是D 啊为什么不能选A?!

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Stopwalkingandlookarouondwhen___theroad.AcrossBacrossCcrossedDcrossing答案是D啊为什么不能选A?!Stopwalkingandlo

Stop walking and look arouond when ___ the road.A crossB acrossC crossedD crossing答案是D 啊为什么不能选A?!
Stop walking and look arouond when ___ the road.
A cross
B across
C crossed
D crossing
答案是D 啊为什么不能选A?!

Stop walking and look arouond when ___ the road.A crossB acrossC crossedD crossing答案是D 啊为什么不能选A?!
祈使句省略了you're,加上去就是现在进行时了