The discovery was a major _______ for research workers.

Câu hỏi :

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

A. break-in

B. breakout

C. breakthrough

D. breakdown

* Đáp án

* Hướng dẫn giải

Đáp án: C Breakthrough= bước tiến quan trọng, breakout= vượt ngục, breakdown= thất bại, break-in= đột nhập.

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