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By the time of 1969, there were many space explorations.A、have beenB、must beC、
By the time of 1969, there were many space explorations.A、have beenB、must beC、
游客
2024-01-01
29
管理
问题
By the time of 1969, there were many space explorations.
选项
A、have been
B、must be
C、had been
D、must have been
答案
C
解析
时态应用根据时间状语by the time of 1969可判断本句表示过去某时刻前发生的动作或状态,应用过去完成时;因此答案为C。
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