The traffic on the main streets has a longer green signal than on the small ones.A. oneB.

问题补充：

The traffic on the main streets has a longer green signal than on the small ones.

A. one

B. this

C. that

D. it

答案：

A. one

B. this

(答案→)C. that

D. it

解析：句意：主干大道的绿色交通信号灯的时间要长于小干道的信号灯。One泛指可数名词单数；that泛指不可数名词；it指代前文出现的事物。

【考点定位】指示代词的用法。