Question

complete the sentence.
_________________________ provided data for thousands of articles, but
it has also contributed to the discovery of dark energy, a force that accelerates the
universes expansion.
not only has the hubble space
telescope
the hubble space telescope has
not only

Explanation:

To complete the sentence with parallel structure, we analyze the correlative conjunction "not only...but also". The second part of the sentence has "has also contributed", so the first part should have "has not only" to maintain parallelism. The option "The Hubble Space Telescope has not only" fits this structure as it sets up the "not only" to pair with "but also" (implied in the sentence's "but it has also"). The other option's structure ("Not only has...") would disrupt the parallelism with the "but it has also..." part.

Answer:

The Hubble Space Telescope has not only