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

The accident ______________ while the man was trying to fix the roof.

A. has happened

B. happened

C. was happened

D. was happening

Đáp án
B. happened

Câu hỏi thuộc Bài tập:

E10- I-learn- Unit 6 (2)