单项选择题

Frequently single-parent children______some of the functions that the absent adult in the house would have served.

A．take off
B．take after
C．take in
D．take on
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单项选择题
When workers are organized in trade unions, employers find it hard to lay them______.
A．off
B．aside
C．out
D．down
单项选择题
In the past 10 years, the company has gradually______all of its smaller rivals.

A．engaged
B．occupied
C．monopolized
D．absorbed
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