Had the seismologists detected the seismic tremors earlier, the evacuation protocol ______ initiated in time.
Answer and explanation
Correct answer: C. would have been
- Step 1: An inverted third conditional ('Had... detected') expresses an unreal counterfactual condition in the past. The main clause requires the perfect conditional passive form: 'would have been + past participle'. Answer: would have been. Why not the others: "will have been successfully initiated" uses future perfect indicative, which is ungrammatical in counterfactual past result clauses; "would be being" uses present conditional continuous, which cannot denote completed past initiation; "had been fully" uses past perfect indicative, which belongs in conditional clauses rather than main results.
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