______ exhaustively on the clinical trial, the researchers submitted their groundbreaking paper to the medical journal.
Answer and explanation
Correct answer: B. Having worked
- Step 1: A perfect participle clause ('having worked') indicates an action completed prior to the action of the main verb ('submitted'). This construction expresses both chronological sequence and the causal background for the subsequent submission. Answer: Having worked. Why not the others: "Working extensively" implies simultaneous action with the verb 'submitted' rather than a completed prerequisite stage; "To have worked hard" uses an infinitive phrase which cannot function as an adverbial participatory clause modifying the subject; "Worked intensely" is a past participle which would convey a passive meaning, implying the researchers were worked.
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