The World Health Organization’s main activities are carrying of research on medical

Câu hỏi :

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part following that needs correcting.

A. main activities

B. carrying of

C. on 

D. improving 

* Đáp án

B

* Hướng dẫn giải

Chọn B

Carrying out research = tiến hành cuộc nghiên cứu. Sửa “of” thành “out”

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