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为什么英语中no sooner than在过去完成时中要用在助动词后实意动词之前?

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为什么英语中no sooner than在过去完成时中要用在助动词后实意动词之前?
为什么英语中no sooner than在过去完成时中要用在助动词后实意动词之前?
no sooner... than:一……就……
1. 当no sooner置于助动词与实意动词之间,句子为正常语序
2. no sooner置于句首,句子需倒装
eg:He had no sooner / No sooner had he arrived than he was asked to leave again