问题补充:
There are many trees on side of the street, and of the trees is still growing.
A. both; the number
B. either; the number
C. both; a number
D. either; a number
答案:
A. both; the number
(答案→)B. either; the number
C. both; a number
D. either; a number
解析:句意:街道两边有许多树,并且树的数量仍在增长。Both两者都,后跟复数名词;either两者中的任何一者,后跟单数名词。The number of…的是数量,作主语时谓语动词用第三人称单数式;a number of许多,修饰复数名词。所以选B。