Mark the letter A, B, C or D on your answer sheet to indicate the option that best completes each of the following questions.

Câu hỏi

My computer crashed __________.

A. when I was in the middle of an important project

B. so I was having an important project

C. because I had an important project

D. before I was doing an important project

E10- I-learn- Thi giữa kỳ 1