单项选择题

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

A．replaced
B．changed
C．substituted
D．exchanged

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

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B．urged
C．thought
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Fill in the blanks in the following options to choose the appropriate words（）

A．risk
B．problem
C．solution
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