And only over the past 30 years have scholars examined history from the bottom up.感觉这句话有点别扭,为什么不是 scholars have examined history .而是have scholars examined . 英语
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【答案】 这是由副词only引起的倒装现象,强调时间状语.
不倒装的话,句子会是And scholars have examined history from the bottom up only over the past 30 years.
Only 开头的句子,常有倒装.另例：
Only after many setbacks was success achieved.
（几经周折才告成功.）