When he knew the disappointing result of the exam, he seemed quite .
A. fed up
B. cast down
C. in vain
D. in amazement
网友回答
A. fed up
(答案→)B. cast down
C. in vain
D. in amazement
解析：短语辨析. A. 厌倦 B. 推翻;;沮丧的 C.徒劳 D.吃惊的.句意:当他知道这个令人失望的考试结果时,他似乎相当沮丧.结合语境可知选B为最佳答案.