He worked ______ at his task for weeks before he felt satisfied that the results

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问题 He worked ______ at his task for weeks before he felt satisfied that the results would justify his long effort.

选项 A、occasionally
B、regularly
C、patiently
D、assiduously

答案 D

解析 (assiduously坚持不懈地，刻苦地)。句意为：他连续好几个星期坚持不懈地执行任务才觉得满意，因为结果表明他长时间的努力是值得的。A．occasionally偶尔；B． regularly定期地；C．patiently耐心地。

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