30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 17)

In one class we had to do a research on the language used in business

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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 questions.

In one class we had to do a research on the language used in business.

one class

a research

the language

business

Giải thích

Đáp án A

one class => one’s class