10/12/2020 11:13 am
Đề cương ôn tập HK1 Anh lớp 12 THPT Lương Ngọc Quyến 2020 Exercise 1: TENSES 1. Experiments in the sonic imaging of moving objects ............... in both the United States and Europe well before the Second World War. A. were conducting B. have been conducted C. had been conducted D. being conducted Theo TTHN |