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 uncle _________ the lightbulb when the ladder fell.

A. was changing

B. has changed

C. is changing

D. changes

Đáp án
A. was changing

Câu hỏi thuộc Bài tập:

ĐỀ SỐ 14 - VŨ MAI PHƯƠNG