单项选择题

[A] By [C] On
[B] In [D] To

A．By
B．In
C．On
D．To
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单项选择题
[A] purposes [C] stages[B] degrees [D] steps
A．purposes
B．degrees
C．stages
D．steps
单项选择题
[A] involves [C] reveals[B] takes [D] invites
A．involves
B．takes
C．reveals
D．invites
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