单项选择题

A) for C) on
B) without D) concerning

A．for
B．without
C．on
D．concerning
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单项选择题
A) before C) as B) when D) after
A．before
B．when
C．as
D．after
单项选择题
A) change C) communicate B) achieve D) remain
A．change
B．achieve
C．communicate
D．remain
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