1

Shall we use the auxiliary verb again after and as in the following case?

The data has been collected and has been proved to be significant.

or

The data has been collected and proved to be significant.

0

It should be "proven" here regardless of the context; "has been proven" is correct over "has been proved".

That said, both "The data has been collected and has been proven" and "The data has been collected and proven" are correct.

Actually, the second sentence is correct for a different reason. "The data has been collected and proved to be significant" would be split up into:

(The data:) (has been collected) and (proved to be significant)

In this case, "proved" would be correct because you are basically saying "The data proved to be significant", and so it is the basic simple past tense. With the first sentence, you would need to say "proven" as the perfect past form.

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