When , the new railway will run for 250 miles.
A. to plete
B. pleted
C. being pleted
D. to be pleted
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A. to plete
(答案→)B. pleted
C. being pleted
D. to be pleted
解析：考查非谓语动词。句中的逻辑主语the new railway与plete之间为被动关系，故用过去分词作状语。句意：当新铁路完成的时候，铁路的运行长度将达250里。故B正确。