单项选择题

The relationship between employers and employees has been studied ______.

A．originally
B．extremely
C．violently
D．intensively
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单项选择题
The car ______ halfway for no reason.
A．broke off
B．broke down
C．broke up
D．broke out
单项选择题
The old couple decided to ______ a boy and a girl though they had three of their own.
A．adapt
B．bring
C．receive
D．adopt
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