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.    

Lately, I ____ about changing my career because I ____ dissatisfied with the conditions at my company. 

• A. A. have been thinking - have become
• B. B. have been thinking - have been become
• C. C. have thought - have become
• D. D. have thought - have been becoming

Tạm dịch: Gần đây tôi đang suy nghĩ về việc thay đổi sự nghiệp vì tôi đã trở nên không hài lòng về điều kiện ở công ty tôi.