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at failing in the maths exam, John wouldn't like to talk about it to his parents.

A．Disappointing

B．Having disappointed

C．Disappointed

D．To be disappointed

試題分析：考查非謂語動詞。be disappointed at sth/doing sth因某事而感到失望，disappointed是形容詞化的過去分詞，類似的還有worried, interested, lost, absorbed等，根據句意可知，是發生過的事情，而不定式表將來，排除D，故選C。

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