单项选择题

______ in debt to anyone, Tony is very careful about the loans.

A．Never has been
B．Having never been
C．Never being
D．Never having been
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单项选择题
Some of the national heroes would ______ some principle all their lives.
A．follow
B．take
C．carry
D．serve
单项选择题
Next to natural resources comes the ability to ______ them to use.
A．take
B．set
C．get
D．turn
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