Question

is the group of words in bold a phrase or a clause? built to honor all the gods, the pantheon is a monument that is an exceptional example of ancient roman architecture. phrase clause submit

Explanation:

A clause has a subject and a predicate (a verb or verb phrase). The bolded group "that is an exceptional example of ancient Roman architecture" contains the subject "that" (referring to "monument") and the predicate "is an exceptional example...", so it's a clause. A phrase lacks a subject - predicate structure.

Answer:

clause