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最佳答案：我很失望I'm very disappointed.
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最佳答案：使我失望是let me down
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最佳答案：I always let you downI always make you disappointed
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最佳答案：I let myself downlet...down 让某人失望
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最佳答案：I hope I won't disappoint you
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最佳答案：I saw that it is disappointment
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最佳答案：I'm very disappointed to you.
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最佳答案：Why did you feel so disappointed yesterday?
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最佳答案：I chose to believe you, but you made me so disappointed.
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最佳答案：I am very/quite disappointed with sb.