Question

She could have been an Olympic figure skater, but she has quit practicing.

Linking verb

Answer 1

has.

Step-by-step explanation:

has is the linking verb.

Answer 2

The correct answer is Could have been

Step-by-step explanation:

Linking verbs are those that link the subject to a predicate or a predicate adjective. They do not describe the subject neither physically nor mentally. They are usually all the different forms of Verb be like in the sentence COULD HAVE BEEN.