单项选择题

A．must have been prevented
B．might have been prevented
C．should have been prevented
D．cattle have been prevented
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单项选择题
A．seriouslyB．immediatelyC．suddenD．permanent
A．seriously
B．immediately
C．sudden
D．permanent
单项选择题
A．riskB．problemC．solutionD．access
A．risk
B．problem
C．solution
D．access
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