单项选择题

A．reason
B．cause
C．course
D．coarse
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单项选择题
A．aroundB．aboutC．onD．of
A．around
B．about
C．on
D．of
单项选择题
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
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
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