<p>As rare as diamonds,some species of coral growing as deep as 2000 feet beneath the sea and are highly prized in the Hawaiian jewelry trade.</p>
<p>A) grow as deep as
B) grown as deeply as</p>
<p>I picked B because “deep” is an adjective. And “deep” (at least I don’t believe…) isn’t referring to the corals being deep. I thought it meant, the corals were found in deep places. So it was modifying the ver, “grown/grow”. But it’s actually A. Why?</p>