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.
_ 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.
问题解答：
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