The archaeological team ______ the excavation by dusk had the monsoon rains not flooded the trench.
Answer and explanation
Correct answer: B. would have completed
- Step 1: The inverted conditional clause 'had the monsoon rains not flooded...' sets up an unreal past condition (third conditional). The main clause requires a past counterfactual result marked by 'would have + past participle'. Answer: would have completed. Why not the others: "completed fully then" uses simple past indicative which fails to convey counterfactual conditionality; "will have finished" uses future perfect indicative which is inappropriate for an unfulfilled past scenario; "had completed work" uses past perfect indicative which belongs in conditional clauses, not main result clauses.
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