2. 外语
  3. By the time of 1969, there were many space explorations.

By the time of 1969, there were many space explorations.

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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 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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