单项选择题


A．effective
B．passive
C．relative
D．expressive
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单项选择题
A．to requireB．requiredC．requiringD．are required
A．to require
B．required
C．requiring
D．are required
单项选择题
A．preventingB．withstandingC．sustainingD．overcoming
A．preventing
B．withstanding
C．sustaining
D．overcoming
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