Question

is there a sentence fragment?
even though rainbows often appear to contain a band of purple. its just an optical illusion.
yes
no
submit

Explanation:

A sentence fragment is an incomplete sentence. The first part "Even though rainbows often appear to contain a band of purple." starts with a subordinating conjunction "Even though" and is a dependent clause, which cannot stand alone as a complete sentence. So there is a sentence fragment.

Answer:

yes