______ at failing in the math exam, John wouldn’t like to talk about it to his parents.A.DisappointedB.To be disappointedC.DisappointingD.Having disappointed
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A解析考察形容词修饰主语。因为主语是John，所以使用形容词Disappointed修饰。短语Disappointed at failing in the math exam修饰主语John。句意：对于数学考试失败感觉很失望，约翰不想和他的父母谈论这个问题。