单项选择题

The heart is an important organ of circulation（）function is to pump blood to all parts of the body.

A．which
B．whose
C．of it
D．its

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单项选择题
I am rather concerned（）her, for I haven' t heard from her since last winter.

A．of
B．at
C．with
D．about
单项选择题
There is no（）that women are playing an important role in the world today.（）

A．of deny
B．to denying
C．denying
D．of denying
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