How can you ___they are grateful?A say B speak out C tell D talk
热心网友
供参考：答案：C. 这里tell不是告诉的意思，而是辨认的意思。这里的意思是说：你怎能辨识出他们的感激？
热心网友
C.If you say: "How can you say that?" [你怎么这么说话?], the word "say" stressed the articulation [强调说话本身] of what you say.
热心网友
A