_ in the 1900s most American towns and cities had a Main Street.A,As early as B,Early C,Early as D_ in the 1900s most American towns and cities had a Main Street.A,As early as B,Early C,Early asD,Earlier请给出解释.
问题描述：
_ in the 1900s most American towns and cities had a Main Street.A,As early as B,Early C,Early as D
_ in the 1900s most American towns and cities had a Main Street.
A,As early as
B,Early
C,Early as
D,Earlier
请给出解释.
答
A，早在20世纪（大多数美国城镇有一条主街道）
答
B,20世纪90年代早期,这些都是副词
答
B
as 后面不能跟in,所以AC不对,这个句子也没有比较所以d也不对