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

游客2024-07-07 41

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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Onepurposeofmarketresearchistolearnaboutpeople—thepeoplewhowillbuy