5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 43

"What is this letter about?" "It's in regard_______ at a conference next week".

10/20

"What is this letter about?" "It's in regard_______ at a conference next week".

to you speak

to our speaking

of our speaking

to you speaking

Giải thích

Chọn đáp án B