Mountains have helped to protect the Swiss from invaders, and indeed, Switzerland has

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

A. to protect

B. from invaders

C. has remained at peace 

D. engaging in war

* Đáp án

* Hướng dẫn giải

Đáp án : D

engaging in war => was engaging in war : đang tham gia vào chiến tranh

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