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When making a compound complex sentence, in this case, I would make sure that my sentence would have a compound, which would contain a clause, and making sure that it would be a complex sentence.
"This vehicle would be very fun to ride, i'm sure it's not that hard.".
This would be an example above. ↑
Answer:
the last option
Explanation:
"Dr. Burke wanted to trust her assistant with the secret formula, but she was afraid her assistant was a spy."