单项选择题

A．in
B．at
C．with
D．for
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单项选择题
Benjamin Franklin deserves credit mainly because ________ .
A．he established the United States postal system
B．he served as the postmaster general
C．he increased the number of post offices
D．he was made postmaster by the U. S.
填空题
Where and when did the worst earthquake ever reported happen
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