BEFORE THESE ( NEW) MACHINES WERE INVENTED, PEOPLE HAD TO QUEUE.

Lớp 9 Tiếng Anh TÀI LIỆU BỒI DƯỠNG TIẾNG ANH LỚP 9 HỌC SINH GIỎI THAM KHẢO

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7. Before these ( new) machines were invented, people had to queue.