If you want to walk 横线the street,you must look left first then right before 横线it

题目

If you want to walk 横线the street,you must look left first then right before 横线it
A.across; acrossing B.cross,across
C.across;crossing B.cross;crossing

答案

C
walk across the street 过马路,动词walk 后用介词 across
before crossing it ,before 是介词,后面跟动词ing 形式.

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