In order for a doctor to (A) practice medicine in any hospital, it must be proved (B) that

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Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following question

In order for a doctor to (A) practice medicine in any hospital, it must be proved (B) that the doctor has the (C) qualities to do (D) so.

practice

that

qualities

Giải thích

Đáp án : C

C: qualifiers -> qualifications

ở đây phải dùng từ có nghĩa là bằng cấp (qualification)