2. 外语
  3. Perhaps all societies (are significantly more advanced) than our own have achieved an effective personal immortality and lose th

Perhaps all societies (are significantly more advanced) than our own have achieved an effective personal immortality and lose th

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问题 Perhaps all societies (are significantly more advanced) than our own have achieved an effective personal immortality and lose the motivation for interstellar gallivanting, which (may), (for all we know), (be) a typical urge only of adolescent civiliza
选项 A、are significantly more advanced
B、may
C、for all we know
D、be
答案A
解析 应去掉are
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