对你很失望 = I'm disappointed on you
be disappointed at sb
Disappoint sb.
对某人很失望Be disappointed with sb
I am very disappointed even despairing about you.
be disappointed about...对某事（物）失望 be disappointed with sb.对某人失望 be disappointed at sth.对某事失望 例：He was disappointed at the result. be disappointed to do...例：I was disappointed to hear that .
对……失望be disappointed about；be disappointed at；对某人失望be disappointed with sb
I'm very disappointed to you .
be disappointed in sb
be disappointed at 对..失望.A disappoints B. A让B失望了.What makes a person disappointed is... 使某人失望的是....
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草本Jing樺
