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Câu hỏi:
The space age began in 1957 ............. the Soviet Union launched Sputnik 1, the world’s first man-made satellite.
- A. which
- B. when
- C. who
- D. whose
Lời giải tham khảo:
Đáp án đúng: B
1957 là một mốc thời gian nên ta dùng when
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