Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Câu hỏi

When I _______ lunch, someone knocked on the door.

A. had

B. was having

C. have had

D. had had

Đáp án
B. was having

Câu hỏi thuộc Bài tập:

E9- Vào 10- Đề ôn 21