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We should always look both ways （ ）you cross the road A unti

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We should always look both ways （ ）you cross the road A until B while C before D after
为什么选C呢 B为什么不可以啊 B可以翻译的通啊
B while所接的从句中,动词要用ing形式.
而且这里用while 也不对,while表示“当……的时候”,而这句话的意思是在你过马路之前要先看两边.
再问： 都要用ing吗 在线等回答 给你满意答案~
再答： 呃，貌似也不是都要用ing的， eg. I lived in a hostel while I was a student. 我求学期间住在青年招待所里。
再问： 那这个时候为什么就要用ing呢....
再答： while表示“当……的时候”时，如果这个动作时短暂性的，如cross,get up等，则动词要用ing形式。这里的话，用while you are crossing the road 也是可以的，但意思没有before好，因为是在过马路之前要先看两边，强调的是过马路之前。
We should always look both ways （ ）you cross the road A unti Before we cross the road,we must stop and look both ways?loo Before we cross the road,we must stop and look both ways.对划线 before we cross the road ,we must stop and look both ways .改 You should look both ways before you ___the road. then look the cross you should road Be careful to look both ways before you cross the street,（ ） should.you road the cross look when 连词成句 用should you road the cross look when 拼一句话 you should look （） first in china when you cross the road,bu When you cross the street ,you must look both ways first的答语 you must look both ways before you go ____(cross,across)the