Answer and explanation

Correct answer: B. hasn't finished

  1. Step 1: Yet is used with the present perfect in negatives.
Answer
hasn't finished.
Why not the others: didn't finished, doesn't finish and isn't finishing do not fit.

Practise more Grammar and Vocabulary.

Free questions with an explanation for every one, and full timed Iraqi National English Proficiency Test (INPT) mock tests.