Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each of sentences in the following questions.
I started training to be an accountant six months ago. I’ve got more months to go and then I have to take exams.
A. By the time I’ve taken my exam, I will have started training to be an accountant for a year
B. By the time I take my exam, I will have been in training to be an accountant for a year.
C. By the time I took my exam, I would have trained to be an accountant for a year.
D. By the time I’ve taken my exam, I will be training for a year.