Mark the letter A, B, C, or D on you answer sheet...

Câu hỏi: Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.

Never_______more people _________ in charity work than now.

A. do/ participate

B. have/ participated

C. did/ participate

D. had/ participated