单项选择题
These national parks are very important for preserving many animals, who would ____ run the risk of becoming extinct.
A．otherwise
B．nevertheless
C．therefore
D．instead
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单项选择题
All that can be done ____.
A．have been done
B．have done
C．has done
D．has been done
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单项选择题
A person beating a drum or blowing a trumpet causes vibrations in the air ____ sound waves.
A．calls
B．called
C．is called
D．are called
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