Before you__the street,you must look to the left and then ri

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Before you__the street,you must look to the left and then right.
在你过马路前,必须左右看一看.
Before you__(go across)the street,you must look to the left and then right.
应该填go across 还是 going across.（P.S.我知道可以填cross）

填go across
解析这个是一个完整的句子有主语 you
如果这里没有you 就用 going across
再问：是不是before后面是一个句子，而不是动词短语，就用do 而不用 doing？
再答：是的

Before you__the street,you must look to the left and then ri Before you cross the street,you must look ___ the left and r We must look to the left and then right before ( ) the stree you must look to the _________first and then the left A.left look right and left before -the street we must look to the left and right before you cross the stre you must look the right first and then the left 可以改为you must 同义句转换 You must look to the right and the left You must look YOU must look left and right f_ .Then you can cross the road If you want to walk 横线the street,you must look left first th Before you c------ the road, you must look left and right Before you c____ the road,you must look left and right