Select the correct third conditional verb form: 'If the engineering team had reinforced the foundation earlier, the retaining wall _____ during the monsoon.'
Answer and explanation
Correct answer: D. would not have collapsed
- Step 1: Third conditional sentences describe counterfactual past conditions: 'if + past perfect, would have + past participle'. Step 2. The apodosis must take the conditional perfect 'would not have collapsed'. Answer: would not have collapsed. Why not the others: 'would not collapse' is second conditional; 'will not collapse' is first conditional; 'had not collapsed' repeats past perfect.
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