I was the middle child of three,and there was agap of five years on( ) side.

题目

I was the middle child of three,and there was agap of five years on( ) side.
A.one B.either D.none

答案

B
on either side 表示"在两个边上都."
如：A lot of trees will be planted on either side of the new highway.
这条新修的公路两旁将要种上很多的树.
你这个题目是在说”三个孩子中的中间这个和老大、老小都是隔的5岁.