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      at failing in the maths exam, John wouldn't like to talk about it to his parents.
A.DisappointingB.Having disappointedC.DisappointedD.To be disappointed
C

试题分析:考查非谓语动词。be disappointed at sth/doing sth因某事而感到失望,disappointed是形容词化的过去分词,类似的还有worried, interested, lost, absorbed等,根据句意可知,是发生过的事情,而不定式表将来,排除D,故选C。
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