摘要：24．---When did he work the railroad?

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---When did he work ______ the railroad?
---From 1904 to 1909．

A.
at
B.
on
C.
for
D.
of

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—When did he work_______the railroad?
—From 1904 to 1909.

A. in
B. on
C. at
D. of

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－When did he work ________ the railroad?

－From 1904 to 1909．

at

on

for

of

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