根据网考网考试中心的统计分析，以下试题在2016-1-12日考博习题练习中，答错率较高，为：83%
【单选题】They are sure they have all the facts they need to ______ the existence of a black hole.
A．obtain
B．maintain
C．verify
D．display
根据网考网考试中心的统计分析，以下试题在2016-1-12日考博习题练习中，答错率较高，为：83%
【单选题】They are sure they have all the facts they need to ______ the existence of a black hole.
A．obtain
B．maintain
C．verify
D．display
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