2. 职称英语
  3. In the past few years there (be) ______ a great increase in the amount of resear

In the past few years there (be) ______ a great increase in the amount of resear

游客2023-09-27  70
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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