单项选择题

In a little more than 200 years, Australia has ______ some drastic social and economic changes.

A．taken
B．made
C．got
D．seen
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单项选择题
In the U. S. , it is common that each state ______ its power to an elected or appointed state board of education.
A．exercises
B．applies
C．adjusts
D．delegates
单项选择题
The wind was so strong that it tore the flag ______.
A．by half
B．at half
C．in half
D．by halves
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