单项选择题

It was when he took a job in a company he began to learn English.

A．when .
B．that
C．which
D．what
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单项选择题
They have all got up, and______.
A．Jack has too
B．so has Jack
C．also has Jack
D．Jack hasn't
单项选择题
People seldom trust him since he usually fails to______his promises.
A．keep to
B．keep on
C．keep off
D．keep up
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