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

In spite of what we said, he refused to（）to the police station.

A．give away
B．give off
C．give himself away
D．give himself up

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

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