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Through _______ archival research spanning twenty years, the historian uncovered the long-suppressed treaty documents.

Aassiduous
Bcursory
Cperfunctory
Ddesultory
Answer & Solution
Correct answer: A. assiduous
'Assiduous' means showing great care, attention, and perseverance. 'Cursory' and 'perfunctory' mean hasty and superficial.
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