The Great Wall is one of the _______ (B. LONG) structures in the world. It was built to protect China from invasions, and it took many years to complete.

Применим протокол А.

1. Определим орфограмму: вставить слово, подходящее по смыслу.
2. Подберем подходящее слово из предложенных вариантов.
3. Проверим, подходит ли слово по смыслу.

Подходит слово long, что значит длинный.

Вставим слово в предложение.

The Great Wall is one of the long structures in the world. It was built to protect China from invasions, and it took many years to complete.

Ответ: The Great Wall is one of the long structures in the world. It was built to protect China from invasions, and it took many years to complete.