【正确答案】 A

【答案解析】[解析] 画线词的原形upset为动词，意为“使心烦”。A项的原形disturb意为“干扰，使不安”；例：She continued to beseech him not to disturb her.她仍旧求他不要打搅她。B项的动词原形sadden意为“使悲伤”；例：I don"t want to sadden you again.我不想再让你伤心。C项的原形anger意为“使发怒，生气”；例：It is better to please a fool than to anger him.对待愚人最好是使他高兴，而不是惹他发怒。D项disappointed意为“使失望”；例：Don"t build him up too much. He may disappoint you.不要过分夸奖他，他可能会让你失望。故本题选A。