单项选择题

A．back
B．in
C．away
D．off
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单项选择题
A．enlargedB．enhancedC．extendedD．strengthened
A．enlarged
B．enhanced
C．extended
D．strengthened
单项选择题
A．retainingB．settlingC．maintainingD．preserving
A．retaining
B．settling
C．maintaining
D．preserving
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