Not until the end of the 19th century ______ become a scientific discipline

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. plant breeding has 

B. did plant breeding 

C. plant breeding had 

D. has plant breeding 

* Đáp án

* Hướng dẫn giải

Đáp án là B.

Sử dụng cấu trúc : Not until + time + did + S +V = It was not until + time that S + Ved: Tận cho đến khi… 

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