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Space exploration began in the 1960s, and since then about five hundred people i

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Space exploration began in the 1960s, and since then about five hundred people i

 Space exploration began in the 1960s, and since then about five hundred people _______ into space.

A. are traveling    B. traveled         C. had traveled           D. have traveled

试题答案

  D

标签：andsinceaboutthenexploration

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