2. 专升本
  3. ______in the twentieth century that a better way was found to investigate the structure of the human brain.

______in the twentieth century that a better way was found to investigate the structure of the human brain.

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问题 ______in the twentieth century that a better way was found to investigate the structure of the human brain.
选项 A、It was
B、It is
C、There were
D、There being
答案A
解析
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