单项选择题

A．by the 1920s
B．by the 1910s
C．by the 1950s
D．by the 1930s
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单项选择题
A．Saying sorry to bother him.B．offering him some help.C．Asking help from him.D．Complaining some problem with her.
A．Saying sorry to bother him.
B．offering him some help.
C．Asking help from him.
D．Complaining some problem with her.
单项选择题
A．She does it everyday.B．Her roommate is doing it.C．She does not do it herself.D．She is a researcher at the lab.
A．She does it everyday.
B．Her roommate is doing it.
C．She does not do it herself.
D．She is a researcher at the lab.
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