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

Câu hỏi

While Tom and I , someone at the door.

A. were talking - knocked

B. were talking - was knocking

C. talked - knocked

D. talked - was knocking

Đáp án
A. were talking - knocked

Câu hỏi thuộc Bài tập:

While Tom and I ____, someone ____ at the door.