He regretted______unable to visit you earlier.A to be B to have been Cbeing D having been.

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He regretted______unable to visit you earlier.A to be B to have been Cbeing D having been.
He regretted______unable to visit you earlier.
A to be B to have been Cbeing D having been.

He regretted______unable to visit you earlier.A to be B to have been Cbeing D having been.
D having been

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