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 civilization

选项 A、are significantly more advanced
B、may
C、for all we know
D、be

答案A

解析
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