it's wrong of you to __ people when they are in trouble A,laugh on B,make fun of A,为什么不对?
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it's wrong of you to __ people when they are in trouble A,laugh on B,make fun of A,为什么不对?
laugh at是固定搭配“嘲笑”
laugh at 才能加sb.
A 应用 laught at 而不是 laugh on