单项选择题

Permanent education is practical because（）

A．there are no limits at all.
B．there are no age limits.
C．no one is getting really too old.
D．no one wants to learn at old age.

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单项选择题
3（）

A．in
B．upon
C．by
D．with
单项选择题
The woman should have arrived by（）

A．10:45.
B．10:40.
C．10:55.
D．11:00.
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