单项选择题
A．resource
B．base
C．source
D．basis
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单项选择题
A．detectedB．detachedC．detainedD．derived
A．detected
B．detached
C．detained
D．derived
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单项选择题
A．considerableB．consideringC．considerateD．consistent
A．considerable
B．considering
C．considerate
D．consistent
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