Find a mistake. Check your grammar.

Follow the example. Example: Why (A) are you standing (B) in the doors? Come in and (C) make (D) oneself at home. Answer: D yourself
Инструкция к тесту
Identify one word or phrase marked А, В, C, or D and underlined that must be changed to make the sentence correct. What’s the correct variant?
Количество вопросов в тесте: 15