It is rude to laugh on our friends. the underlined part that needs correction

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.
It is  rude to laugh  on our friends.

A.is

B.rude

C.laugh

D.on

* Đáp án

* Hướng dẫn giải

Đáp án đúng là D. on => at. Cụm “laugh at someon”: cười vào mặt ai

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