单项选择题

Water is to fish ______ air is to man.

A．that
B．what
C．like
D．as
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单项选择题
People tend to buy more things than ______.
A．it is necessary
B．being necessary
C．is necessary
D．to be necessary
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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