Does the sentence contain faulty parallel structure? the doctor knew not only that her patientwould improve but also would improve butalso completely recoverselect the correct answer.
yes
no

Yes. The sentence with correct parallel structure would be as follows. The doctor known only that her patient would improve, but also knew that her patient would [can't understand the sentence after that, but nevertheless it is still faulty].

The answer is yes. However, the other respondent provided you with an inaccurate (and non-parallel) sentence correction.
The correct syntax -- and parallel structure -- is...
The doctor not only knew that her patient would improve, but she also knew that he would completely recover.