Answer and explanation

Correct answer: D. If she had studied harder, she would have passed the exam.

  1. Step 1: The third conditional is about an unreal past: had plus participle, would have plus participle.
  2. Step 2: Only the sentence 'If she had studied harder, she would have passed the exam' has that form.
Answer
If she had studied harder, she would have passed the exam.
Why not the others: The others are first or second conditionals, or mixed wrongly.

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