单项选择题

Fill in the blanks in the following options to choose the appropriate words（）

A．seriously
B．immediately
C．sudden
D．permanent

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单项选择题
Fill in the blanks in the following options to choose the appropriate words（）

A．must have been prevented
B．might have been prevented
C．should have been prevented
D．cattle have been prevented
单项选择题
Fill in the blanks in the following options to choose the appropriate words（）

A．if
B．when
C．as
D．since
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