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.    

If you say bad things about the person who gives you a job, you BITE THE HAND THAT FEEDS YOU.

• A. A. be unfriendly
• B. B. be thankful
• C. C. be devoted
• D. D. be ungrateful

bite the hand that feed you = phản bội, vô ơn
=> B