单项选择题


A．to require
B．required
C．requiring
D．are required
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单项选择题
A．preventingB．withstandingC．sustainingD．overcoming
A．preventing
B．withstanding
C．sustaining
D．overcoming
单项选择题
A．independentlyB．repeatedlyC．logicallyD．generally
A．independently
B．repeatedly
C．logically
D．generally
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