They are going to plant trees _____side of the road.A.on both B.in both C.on either D.in either
问题描述：
They are going to plant trees _____side of the road.A.on both B.in both C.on either D.in either
答
C
both 后面使用复数,淘汰有both的选项 AB
either 或者,两者之一,后面名词单数
表示"在街,路或河的两边"通常用on或at.表示"在街,路,河的这边,那边或另一边"通常也用on