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There is ample evidence of that about 700 million years ago, glaciers reached well into what are now tropical regions.

答案是說將of that 改為 that, 因為that about 700 million years ago 是子句，但這子句為何沒有動詞啊?是不是題目有點問題呢?

There is ample evidence  that (about 700 million years ago, ) glaciers reached well into what are now tropical regions.

这样也许你好理解些。

謝謝了，了解!