Mountains have helped (A) to protect the Swiss (B) from invaders, and indeed, Switzerland (C) has remained at peace while other European nations (D) engagin...

Câu hỏi :

Mountains have helped (A) to protect the Swiss (B) from invaders, and indeed, Switzerland (C) has remained at peace while other European nations (D) engaging in war.

A to protect

B from invaders

C has remained at peace

D engaging in war

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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