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
Before his death last year, Professor Johnson decided that he（）leave $ 2,000,000 to his university.

A. can
B. would
C. may
D. shall
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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