According to the passage, which of the following posed the biggest obstacle to the development of military forts?

Câu hỏi :

According to the passage, which of the following posed the biggest obstacle to the development of military forts?

A Insufficient shelter  

B Shortage of materials

C Attacks by wild animals    

D Illness

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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