问题
选择题
There are many trees on _______ side of the road and _______ sides of the river.
A. both, both B. either, either C. either, both
答案
答案：C
题目分析：both两者都，后面的名词side用复数sides, either两者之一，后面的名词用单数side.故选C
点评：考题中还会出现这两个词的固定短语：both…and…, either…or…