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Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
In the 19th century new methods of transportation, in particular canals and railways, ________ for transporting goods from places to places.
- A. are developed
- B. were developed
- C. have been developed
- D. had been developed
trả lời câu hỏi trước khi xem đáp án bên dướiYOMEDIACâu 1 Đáp án đúng: B
Đáp án đúng là B
Giải thích: Hành động đã xảy ra hoàn toàn trong thế kỉ 19 (in the 19th century) -> chia quá khứ đơn
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