This painting is believed _ painted by Leonardo Da Vinci.
a) that it is
b) to be
c) being
d) to have been.

The correct answer is d) to have been.

Full sentence: This painting is believed to have been painted by Leonardo Da Vinci.

We use to have been painted because the action happened in the past, and the sentence is passive: the painting did not paint itself, someone painted it.

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