Question

______the road ,don’t forget to look both ways.

A. As crossing
B. While you cross
C. While crossing
D. Cross

Answer 1

答案C

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。