单项选择题

A．improving
B．increasing
C．raising
D．decreasing
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单项选择题
A．ThereforeB．NeverthelessC．HoweverD．Moreover
A．Therefore
B．Nevertheless
C．However
D．Moreover
单项选择题
A．retainsB．holdsC．keepsD．remains
A．retains
B．holds
C．keeps
D．remains
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