eat or drank while walking down the street为什么要用drank?

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• eat or drank while walking down the street为什么要用drank?
• you shouldn't eat or drink while walking,为什么要用walking
• 英语学霸进来看看~有这样一道题：The girl was walking down the street_____she saw a car accident.A.while;happen B.when;happen C.while;happening D.when;to happen为什么答案是A而不是B?
• you shouldn't eat or drink while walking,为什么要用walking
• (1)have,what,of,rules,your,do,you,in,class,kinds (2)pick,you'd,not,up,your,to,better,eat,bowl(3)walking,you,while,eat,down,street,shouldn't,the(连词成句）
• while walking in the street ,you have to be very careful toavoid__down by passing cars or trucks.a.to be knocked b.being knocked 答案为什么不是a?不应该是将来吗?虽然avoid+doing,可是前面还有while while 的主句不是要+done吗?在什么时候while +done：doing+when?都表示什么?就像这道题while watching tv,___ a.the doorbell rang b.we heard the doorbell ring c.we heard the doorbell rings d.we heard the doorbell rang 如果是B.C.D怎么分析?为什么?
• eat or drank while walking down the street
• here,you,the,means,can't,sign,litter（.）（连词成句）
• 改错The sign on the cage means no eat or drink.