2. 职称英语
  3. A million years ______ but a brief span in the history of our planet.A、have been

A million years ______ but a brief span in the history of our planet.A、have been

游客2023-11-21  49
问题 A million years ______ but a brief span in the history of our planet.
选项 A、have been
B、are
C、is
D、has been
答案 C
解析 语法结构题。此题考查主谓数的一致。a million years作为一段时间，为单数概念，因此其谓语应为单数is。
转载请注明原文地址:https://tihaiku.com/zcyy/3207032.html
相关试题推荐
随机试题
最新回复(0)