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单选题

In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.

发布日期:2021-06-09

In the past 50 years, there _____ a great increase...
A

was...did

B

has been...to be done

C

was...doing

D

has been...done

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此试题出现在

全国大学生英语竞赛(NECCS)

系列之一:A类

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