问题
选择题
— When did he work _____ tile railroad?
— From 1904 to 1909. [ ]
A. at
B. on
C. for
D. of
答案
答案：B
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— When did he work _____ tile railroad?
— From 1904 to 1909. [ ]
A. at
B. on
C. for
D. of
答案：B