If you want to walk 横线the street,you must look left first then right before 横线itA.across; acrossing B.cross,acrossC.across;crossing B.cross;crossing
问题描述：
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
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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