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.
单项选择题
What’s Mr. Smith’s trouble
A．He locked his keys in his apartment.
B．He doesn’t know when the Andersons come back.
C．He has to wait outside.
D．He didn’t dress well for the party.
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