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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 | 
