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

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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.

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

plant breeding has

did plant breeding

plant breeding had

has plant breeding

Giải thích

Đáp án B

Kiến thức: Not until + thời gian trong quá khứ + did + S + Vo [ mãi cho đến khi...thì...]

Tạm dịch: Mãi cho đến cuối thế kỷ 19 thì trông cây đã trở thành một quy tắc khoa học.