It can be inferred that railroad refrigerator cars came into use _________ .

Câu hỏi :

It can be inferred that railroad refrigerator cars came into use _________ .

A after 1900  

B after 1920  

C before 1890  

D before 1860

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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