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
Space exploration began in the 1960s, and since then about five hundred peopleinto space.
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解决时间 2021-02-09 21:50
- 提问者网友：几叶到寒
- 2021-02-09 07:20
最佳答案
- 五星知识达人网友：西岸风
- 2021-01-26 23:26
(答案→)A. have traveledB. traveledC. had traveled D. are traveling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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- 1楼网友：刀戟声无边
- 2019-12-14 09:03
这个解释是对的
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