Какой правильный вариант? They usually go to school .... foot. A. in. B on. C. by

Question

Какой правильный вариант?

They usually go to school .... foot.
A. in. B on. C. by

Answer 1

Правильный ответ будет on

Answer 2

ON foot - исключение из правила, с остальными будет предлог by
BY bus, BY train, BY plane и т.д.