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

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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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