单项选择题

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

A．and
B．then
C．before
D．but

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

A．stated
B．urged
C．thought
D．stressed
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