单项选择题

It is imperative that the students（）writing their papers by the end of the month.

A．finish
B．must finish
C．will finish
D．are to finish

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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
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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