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A．He established a government service.
B．He developed a system called 'star routes'.
C．He built a lot of post offices.
D．He established the postal system.

A.He
B.
B．He
C.
C．He
D.
D．He
E.

【参考答案】

D
解析：WhydidBenjaminFranklindeservecredit?

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A．He established a government service.B．He developed a system called 'star routes'.C．He built a lot of post offices.D．He established the postal system.