24．---When did he work the railroad? 【查看更多】

 

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---When did he work ______ the railroad?

---From 1904 to 1909．


  1. A.
    at
  2. B.
    on
  3. C.
    for
  4. 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．

[　　]
A．

at

B．

on

C．

for

D．

of

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