If I had studied harder, I ___ the exam.

Answer and explanation

Correct answer: C. would have passed

  1. Step 1: A past unreal condition uses had plus participle and would have plus participle.
  2. Step 2: So would have passed is correct.
Answer
would have passed.
Why not the others: Would pass and will pass belong to other conditionals, and had passed repeats the tense of the if clause.

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