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

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

A. cleans                     

B.  had cleaned

C. has cleaned

D. was cleaning

* Đáp án

D

* Hướng dẫn giải

Đáp án D

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

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