He failed in the driving test again. He .
A. must have disappointed
B. must have been disappointed
C. might be disappointed
D. couldn’t be disappointed
网友回答
A. must have disappointed
(答案→)B. must have been disappointed
C. might be disappointed
D. couldn’t be disappointed
解析：must have done 对过去的事情的肯定推测，“一定-----”；might do 对现在或将来的事情肯定推测，“也许----”；couldn’t do ---- 用于否定推测“不可能----”。由failed可知是过去的事情，所以他那时一定很失望，对过去的事情的肯定推测。句意为：他考驾照再次失败了，他一定很失望。