单项选择题

Hello! Aviation Electronics Could I speak to Mr. Jones on ______ 8866, please

A．extension
B．branch
C．system
D．exchange
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单项选择题
I had to pay ______ on a carpet I brought in through the Customs today.
A．taxes
B．rates
C．fines
D．duty
单项选择题
The National Geographic Society headquarters, ______ in Washington, DC, is well-known for its magazine.
A．situated
B．placed
C．stood
D．positioned
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