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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单项选择题
______ with the size of the whole earth, the highest mountain does not seem high at all.
A．When compared
B．Compare
C．While comparing
D．Comparing
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
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