单项选择题

A．stage
B．era
C．phase
D．century
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单项选择题
A．toB．inC．up toD．until
A．to
B．in
C．up to
D．until
单项选择题
A．Income, years of schooling, and job type.B．Income and work environment.C．Education and mood.D．Occupation and influence of family members.
A．Income, years of schooling, and job type.
B．Income and work environment.
C．Education and mood.
D．Occupation and influence of family members.
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