Space exploration began in the 1960s, and since then about five hundred people
题型：不详难度：来源：
Space exploration began in the 1960s, and since then about five hundred people into space. | A．have traveled | B．traveled | C．had traveled | D．are traveling |
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答案
| A |
解析
| 本题考查时态。根据时间状语since then可知与完成时连用。句意：太空探索开始于20世纪60年代，自从那以后大约有500人游览过太空。 |
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