In the 19th century new methods of transportation, in particular canals and railways, _______ for transporting goods from places to places.

Câu hỏi :

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

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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