问题
单项选择题
Wang Qing did not come to the meeting; he ______ the notice on the blackboard since we saw it on our way to the dining-hall.
A．must not have missed
B．could not miss
C．could not have missed
D．wouldn't have missed
答案
参考答案：C
解析：表示对过去情况的否定推断，用could(can)not have done。