摘要： All possible means . However, nothing can him dying of lung cancer.A．has tried; stopB．have been tried; keepC．has been tried; preventD．have been tried; stop
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All possible means ________. However, nothing can ________ him dying of lung cancer.
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A．has tried, stop
B．have been tried, keep
C．has been tried, prevent
D．have been tried, stop
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