Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.    

She hasn't paid as much attention to her children as she ____ since she ____ working.

• A. A. does – starts
• B. B. did - started
• C. C. was doing - was starting
• D. D. has done - would start

Tạm dịch: Cô ấy không để ý nhiều đến các con của cô ấy như trước kia kể từ khi cô ấy bắt đầu đi làm
=> B