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

試題分析：考查非謂語(yǔ)動(dòng)詞。be disappointed at sth/doing sth因某事而感到失望，disappointed是形容詞化的過(guò)去分詞，類似的還有worried, interested, lost, absorbed等，根據(jù)句意可知，是發(fā)生過(guò)的事情，而不定式表將來(lái)，排除D，故選C。
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