Choose the correct completion of the conditional inversion:
_____ the structural engineers known about the subsurface fault line, they would have redesigned the skyscraper's foundation.
Answer and explanation
Correct answer: C. Had
- Step 1: Analyze the counterfactual conditional structure: the result clause uses third conditional past counterfactual form ("would have redesigned"). The standard if-clause is "If the structural engineers had known...".
- Step 2: Apply conditional inversion: omitting "If" in a third conditional clause requires inverting the auxiliary "had" to the clause-initial position: "Had the structural engineers known...".
Answer
Had.
Why not the others: "Were" is used for inverted second conditional present counterfactuals ("Were the engineers to know..."); "Should" is used for inverted first conditional hypothetical scenarios ("Should the engineers discover..."); "Did" does not form counterfactual past conditionals.
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