2. 外语
  3. A million years ______ but a brief span in the history of our planet.

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

admin2014-09-18  20
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 此题考查主谓数的一致。a million years作为一段时间，为单念，因此其谓语应为单数is。
转载请注明原文地址:https://kaotiyun.com/show/kcTK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)