The boys worked slowly for they knew that as soon as they____________ (finish) one exercise the teacher would tell them to do the next.Đoạn văn77/95The boys worked slowly for they knew that as soon as they __________ (finish) one exercise the teacher would tell them to do the next.Click vào chỗ trống để nhập đáp án. Nhấn Enter để xác nhận, Esc để hủy.Giải thíchfinished/ had finished