题目内容:
In 1691, to boost trade and ensure its control of North America, Britain () a centralized postal system.
A.authorized
B.rudimentary
C.appreciation
D.debuted
参考答案:
In 1691, to boost trade and ensure its control of North America, Britain () a centralized postal system.
A.authorized
B.rudimentary
C.appreciation
D.debuted