1. 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
</penetrate>
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