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 system crashed when she _________ to submit her paper.

A. has tried

B. was trying

C. would try

D. is trying

Đáp án
B. was trying

Câu hỏi thuộc Bài tập:

ĐỀ SỐ 16 - VŨ MAI PHƯƠNG