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

My foot slipped and I fell when I ________ up the stairs.

A. have run

B. am running

C. run

D. was running

Đáp án
D. was running

Câu hỏi thuộc Bài tập:

ĐỀ SỐ 18 - VŨ MAI PHƯƠNG