At night we can see colorful lights on both of the streets. A. sides B. side C. side’s

问题补充：

At night, we can see colorful lights on both of the streets.

A. sides B. side C. side’s

答案：

解析：句意：在晚上，我们可以在大街的两边看到彩灯。结合语境可知用复数名词sides，选A。