52.

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

By the time Liana went back to school, the prepositional phrase is used as an adverbial, the subject and predicate of the sentence should appear in the underlined part, the subject should be the logical subject of the adverbial, that is, she, and the predicate verb should be judged according to "by + past time" The past perfect tense, so the G term is correct.