Mark the letter A, B, C, or D on your answer sheet to indicate the sentence each of the following questions.Câu hỏi He started working as a bank clerk 3 months ago. A. He last worked as a bank clerk 3 months ago. B. The last time she worked as a bank clerk was 3 months ago. C. He has been working as a bank clerk for 3 months. D. He didn't work as a bank clerk 3 months ago.