Choose the correct form: If I ____ known about the test, I would have prepared.
- A. have
- B. had
- C. would have
- D. has
Explanation
The third conditional describes an unreal past and takes if plus past perfect in one clause and would have plus past participle in the other. Writing if I would have known is a common error and is marked wrong. The pattern always keeps would out of the if clause.
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