GRE考试

根据网考网考试中心的统计分析，以下试题在2019/10/7日GRE考试习题练习中，答错率较高，为：66%
【单选题】One encouraging sign in the problem of chaos among the soldiers' ranks was their vow, for what it was worth, to act in a more ------- way.


A．concerted
B．ingenious
C．defiant
D．avid
E．(E) diligent