English MCQS - QUESTION DETAILS

Choose the sentence with correct use of the conditional perfect tense:
A. If I would have known, I would have helped.
B. If I knew, I would help.
C. If I know, I would help.
D. If I had known, I would have helped.

The correct form is "If I had known, I would have helped," using the conditional perfect tense for a unrealized condition in the past.

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