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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
2024-09-28
31
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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
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。
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