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.

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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。
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