By the time the eminent lexicographer finishes compiling the revised historical dictionary late next year, she ___ on this monumental scholarly project for over four decades, unearthing unprecedented etymological connections.

Detailed Explanation

The correct option is (a). The sentence establishes a specific point in the future ('late next year') up to which an ongoing action will have been in progress for a duration ('for over four decades'). According to English grammar rules regarding tense aspect, the future perfect continuous (or progressive) tense—formed by 'will have been' plus the present participle—is required to express an ongoing action stretching across a duration leading up to a designated future milestone. For a detailed breakdown of verb aspects and temporal frameworks, refer to the Wikipedia Reference on future continuous and perfect constructions.

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By the time the eminent lexicographer finishes compiling the revised historical dictionary late next year, she ___ on this monumental scholarly project for over four decades, unearthing unprecedented etymological connections.

Detailed Explanation

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