there are many trees on __ sides of the road.there are many trees on __ side of the road.

问题描述:

there are many trees on __ sides of the road.there are many trees on __ side of the road.
这两个问题有什么区别呢 为什么答案不一样

both

each

第一个空 后面是 sides,复数,是双排;所以用both
第二个空 后面是 side ,单数,是单排;所以用each