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?

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?
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?

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