A. the first scientist believed B. the first scientist to believe C. a first scientist believing D. a first scientist believedĐoạn văn19/83Mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 19 to 23. the first scientist believed the first scientist to believe a first scientist believing a first scientist believedGiải thíchChọn đáp án A