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

It was my father' s wish in his will that I（）become an engineer.

A．should
B．would
C．might
D．could

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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