(A) According to a research, (B) many traumatic experiences (C) has been

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

(A) According to a research, (B) many traumatic experiences (C) has been traced to events (D) during childhood

according

many

has been

during

Giải thích

Chọn đáp án C (has been have been)

- traumatic experiences (cụm danh từ số nhiều): những trải nghiệm về sang chấn

"Theo một nghiên cứu, nhiều trải nghiệm về sang chấn xuất phát từ các sự việc trong thời thơ ấu."