Câu hỏi :

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

A. farming

B. Purdue University

C. research

D. a horse-drawn plow

* Đáp án

* Hướng dẫn giải

A

“it’s” được thay thế cho farming trong vế trước đó: “Farming has come a long way since the days of horse-drawn plows..”

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