--you ___ Tom about the change of the schedule for the trip -- oh God .I gorget all about itA may tell B muat have told C should tell 选 B 为什么C 不对怎么理解

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--you ___ Tom about the change of the schedule for the trip -- oh God .I gorget all about itA may tell B muat have told C should tell 选 B 为什么C 不对怎么理解
--you ___ Tom about the change of the schedule for the trip -- oh God .I gorget all about it
A may tell B muat have told C should tell 选 B 为什么C 不对怎么理解

--you ___ Tom about the change of the schedule for the trip -- oh God .I gorget all about itA may tell B muat have told C should tell 选 B 为什么C 不对怎么理解
这道题考查的是虚拟语气的用法,must have done sth.表示期望对方已经做过某事(事实上没有做),C选项不含有这层意思.

这地方must表示推测,猜测。should没有此种用法。