His father began to work ________ his childhood.

His father began to work ________ his childhood.
A.since
B.before
C.as early as
D.while
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redmantis 幼苗

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答案C
as…as结构在句中作状语,此时该结构后如果有介词就将它省略,如as early as (in) 1990,as far as (to) the river."

1年前

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