Question

If I ____________ harder, I would have succeeded.

• A. work
• B. worked
• C. had worked
• D. have worked

Answer 1

Answer:

C. had worked

The sentence is a third conditional sentence (past unreal condition).

Structure of third conditional:
👉 If + had + past participle, … would have + past participle

Here:

• “would have succeeded” shows past unreal result.

• So the correct form in the if-clause is had worked.