Mark the letter A, B, C, or D to show the underlined part that needs correction in each of the following questions.
Trả lời câu hỏi dưới đây:
It is important that you turned off the heater every morning before you leave for class.
B => turn off
- Mệnh đề trước that sử dụng thì HT => sau nó phải là thì HT or TL