Question

Have you ever thought about traveling to another country? Pick a place that interests you, and where your native language is not spoken. Once you have picked a place, you can research language-learning options. You can use online programs or find a class. You could learn and practice with a friend, and then take a dream vacation. Learning a language can be difficult. It is one of the the most useful hobbies. I’ve tried it.

What compound-complex sentence can be formed from the underlined section of the passage?

Learning a language can be a difficult and useful hobby; I’ve tried it.
Learning a language can be difficult; it is one of the most useful hobbies I’ve tried.
Learning a language can be difficult, it is one of the most useful hobbies I’ve tried.
Learning a language can be difficult, yet it is one of the most useful hobbies that I’ve tried.

Answer 1

Correct answer:
Learning a language can be difficult, yet it is one of the most useful hobbies that I’ve tried.

Explanation: this sentence has two independent clauses ("Learning a language can be difficult" and "it is one of the most useful hobbies") joined by the coordinating conjunction yet, plus a dependent (relative) clause "that I’ve tried," so it is compound-complex.