Exercise 1. Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. (1.6 points)

Câu hỏi

I _______ along the street when I suddenly heard footsteps behind me.

A. was walking

B. walk

C. am walking

D. walked

Đáp án
A. was walking

Câu hỏi thuộc Bài tập:

ĐỀ CƯƠNG ÔN HỌC KỲ 1