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 competition’s rules _______ to students by our Maths teacher.

A. were explained

B. explain

C. have explained

D. had explained

Đáp án
A. were explained

Câu hỏi thuộc Bài tập:

ĐỀ SỐ 17 - VŨ MAI PHƯƠNG