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.    

Mr Lane urged any parents who have concerns about the disease to seek medical help AT ONCE.

• A. A. immediately
• B. B. forthwith
• C. C. rightway
• D. D. in due course

at once = immediately = rightaway = forthwith = ngay lập tức
in due course = từ từ, bình tĩnh
=> D