Some of the tunnels in the cliff are totally natural; some others were carved out by soldiers for defensible purposes.

Câu hỏi :

Some of the tunnels in the cliff are totally natural; some others were carved out by soldiers for defensible purposes.

A of

B totally

C some others

D defensible

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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