When Alan Shepard travelled into space in May Yuri Gagarin became the first person in space on April th

Câu hỏi :

When Alan Shepard travelled into space in May 1961, Yuri Gagarin became the first person in space on April 12th, 1961.

* Đáp án

* Hướng dẫn giải

Đáp án: became → had become

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