Mark the letter A, B, C or D on your answer sheet to indicate the correct answer in each of the following questions.(from 6 to 30).
Trả lời câu hỏi dưới đây:
Susan wasn’t in when I arrived. I suppose she..................... I was coming.
Diễn tả một dự đoán chắc chắn xảy ra: ....must have done....