单项选择题


A．been used to
B．used to
C．been used for
D．used for
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单项选择题
A．consists ofB．belongs toC．housesD．composes
A．consists of
B．belongs to
C．houses
D．composes
单项选择题
During the years from 1957 to 1976, the birth rate of the United States
A．increased
B．experienced both falls and rises
C．was reduced
D．remained stable
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