单项选择题


A．general
B．regular
C．relative
D．essential
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单项选择题
A．retainsB．holdsC．keepsD．remains
A．retains
B．holds
C．keeps
D．remains
单项选择题
A．ThereforeB．NeverthelessC．HoweverD．Moreover
A．Therefore
B．Nevertheless
C．However
D．Moreover
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