His employers could not complain about his work because he was ______ in the performance of his duties.
A. derelict B. penetrating C. diversified D. assiduous.
[employer]
employer 雇主，老板
employee 雇员
[/employer]
[assiduous]
assiduous 勤奋的
insidious 阴险的，狡诈的
[/assiduous]
[derelict]
derelict 遗弃物
relics 遗骨
relict 残余物
[/derelict]
[penetrate]
penetrate 穿透
permeate 渗透
diffuse 弥漫
diversify 使不同
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