Choose the correct completion for the third conditional sentence: 'If the team ______ the laboratory safety protocol, the chemical spill would never have occurred.'
Answer and explanation
Correct answer: B. had followed
- Step 1: Third conditional sentences express counterfactual past conditions: If + past perfect, would have + past participle. Step 2. The past perfect verb form is 'had followed'. Answer: had followed. Why not the others: 'Followed' is simple past (second conditional); 'would follow' and 'would have followed' should not appear in the if-clause.
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