单项选择题


A．for
B．in
C．with
D．on
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单项选择题
A．acquiringB．requiringC．sustainingD．retaining
A．acquiring
B．requiring
C．sustaining
D．retaining
单项选择题
A．considerableB．considerateC．consideringD．considered
A．considerable
B．considerate
C．considering
D．considered
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