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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
While he ________ the house, his friend called.
A. cleans
B. had cleaned
C. has cleaned
D. was cleaning
While he ________ the house, his friend called.
A. cleans
B. had cleaned
C. has cleaned
D. was cleaning
Kiến thức thời thì
While + S + was/ were + V.ing, S + Ved. Diễn tả 1 hành động đang diễn ra thì có hành động khác xen vào.
While + S + was/ were + V.ing, S + Ved. Diễn tả 1 hành động đang diễn ra thì có hành động khác xen vào.
Đáp án D.