----- Have you informed Tom and Ann that some foreign experts will visit our pany at 8:00 tomorrow morning?
------ Yes, I have. But of them asked me to tell you that they would not be able to e.
A. any
B. either
C. both
D. two
网友回答
A. any
B. either
(答案→)C. both
D. two
解析：根据问话中Tom和Ann是两个人，又根据But表示转折，所以选C，both表示两者都。