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I _ helped you if I had known.

Correct answer: B. Could have

  • A. Will have
  • B. Could have
  • C. Should
  • D. Would

Explanation

The correct answer is 'could have' because it accurately conveys the past conditional tense required in the sentence. The sentence structure indicates a hypothetical situation in the past where the speaker did not know something that prevented them from helping. The other options do not appropriately fit this context and do not convey the same meaning as 'could have.'

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Tenses show when an action or state occurs and whether it is complete, continuing or repeated. The work covers present, past and future forms, including simple, continuous, perfect and perfect continuous constructions, as well as sequence of tenses and the difference between tense and aspect.

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