._____the road ,don't forget to look both ways ._____the road ,don't forget to look both ways . A While you cross B While crossing C As crossing

._____the road ,don't forget to look both ways ._____the road ,don't forget to look both ways . A While you cross B While crossing C As crossing
._____the road ,don't forget to look both ways .
_____the road ,don't forget to look both ways .
A While you cross B While crossing C As crossing

._____the road ,don't forget to look both ways ._____the road ,don't forget to look both ways . A While you cross B While crossing C As crossing
B While crossing

B While crossing

B coss是个持续性动作，用 While
While 后面要跟动词ing,A不能选。

选A
过马路的时候，别忘了看两遍
A 有连词while,所以允许有主谓
BC虽然是非谓语，但是，主句是祈使句，没有主语，在语法上，逗号前后都没有主语，虽然在这里不会引起歧义，但是，在某些地方会引起歧义

B 答案正确