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Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
The discovery was a major _______ for research workers.

C. breakthrough

D. breakdown

Giải bởi Vietjack

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

A. an old interesting painting French

B. a French interesting old paint

C. a French old interesting painting

D. an interesting old French painting

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B. good advice

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A. which of many

B. many of them

C. many of which

D. many of that

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Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.The discovery was a major _______ for research workers.