____ to the left first when you cross the road,or an accident may happen to you.

题目

____ to the left first when you cross the road,or an accident may happen to you.
A.Look B.Looking C.To look

答案

A
这个题你要从句子结构进行考虑,
前面为一个完整的句子（后面是or引导从句）,如果用BC前面就不是一个完整的句子了
用Look相当于前面是个祈使句.