单项选择题
A.concerning
B.concern
C.being concerned
D.concerned
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单项选择题
A.forB.inC.withD.on
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
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