-Was the United State of America founded on July 4th, 1776？
--You be right but I need to check it in the history textbook anyway.
A. have to
B. must
C. may
D. will
网友回答
A. have to
B. must
(答案→)C. may
D. will
解析：句意：--美国成立于1776年的7月4号吗？--你可能是对的，但是我需要核实历史书。从but I need to check it in the history textbook anyway.可知说话的人不太确定，用may可能，可以，have to不得不，must必须，will将会，所以选C。