单项选择题

A．places
B．nests
C．residences
D．habitats
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单项选择题
How often does the APEC hold its meeting
A．Once a month.
B．Once a year.
C．Every 10 years.
D．Every Sunday.
单项选择题
A．inB．byC．atD．on
A．in
B．by
C．at
D．on
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