the road ,don’t forget to look both ways.
A. As crossing
B. While you cross
C. While crossing
D. Cross
网友回答
A. As crossing
B. While you cross
(答案→)C. While crossing
D. Cross
解析：
这题考查时间状语从句的省略式，当主从句的主语一样时，可以省略从句的主语和be动词，这题的while crossing就省略了you are，句意是：当你过马路时，别忘了两边看看。选C。