2. 外语
  3. In the past few years there (be) ______ a great increase in the amount of research on the brain.

In the past few years there (be) ______ a great increase in the amount of research on the brain.

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问题 In the past few years there (be) ______ a great increase in the amount of research on the brain.
选项
答案has been
解析 in the past/last few years/weeks/days作状语，句子用现在完成时。
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