题目内容

Space exploration began in the 1960s, and since then about five hundred people    into space.
A．have traveledB．traveledC．had traveled D．are traveling
A
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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