Question

Identify the following group of words as either a complete sentence or a fragment. A doctor has invented a new surgical tool.

Answer 1

A line could be considered as a complete sentence if it both contains subject, verbs or predicate that make the whole idea in the line complete.

A Doctor (subject) +  has Invented (verb) +  a New Surgical Tool

So the line above could be considered as a complete sentence.

Answer 2

Complete sentence is your answer