-- that they had made an important discovery in science.

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• the professor is said___another important discovery为什么是to have made而不是having made
• Little did they realize that they had made an important discovery in science.题目中的倒装句可不可以改成：Little they realized that they had made an important discovery in science.如果可以,这两句有什么区别,动词提前的话,意义上会有什么不同?
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• the professor is said___another important discovery为什么是to have made而不是having made
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