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.  

 A number of colleagues ____ volunteered to the work.

• A. A. have
• B. B. has
• C. C. to have
• D. D. having

A number of + N => động từ chia số nhiều
=> A