BB pg 661 #26 Writing Question

<li>John Edgar Wideman is regarded to be one of the most talented writers of the late twentieth century and is often compared to such literary giants as Ralph ellison and Richard Wright. No error</li>
</ol>

<p>the answer is A, but I don’t understand whats wrong with “to be”
can someone explain?</p>

<p>It should be "regarded as", I believe this is an idiom error?...
Correct me if I'm wrong..</p>

<p>Yes; it's regarded as.</p>

<p>yeah.
regard...as
considered...to be(sometimes nothing if its "consider")
known...as
lol maybe we should compile an idiom list?</p>